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This is a HL7 FHIR server, and as you appear to be accessing this page from a web browser you are seeing a HTML version of the requested resource(s). You can also access this URL from a FHIR client as a ReSTful API call. For more details please see the HL7 FHIR specification.
<?xml version="1.0" encoding="UTF-8" standalone="no"?><StructureDefinition xmlns="http://hl7.org/fhir">
   <id value="CareConnect-DCH-Weight-Observation-1"/>
   <meta>
      <lastUpdated value="2018-03-29T17:20:18.431+01:00"/>
   </meta>
   <extension url="http://hl7.org/fhir/StructureDefinition/structuredefinition-wg">
      <valueCode value="oo"/>
   </extension>
   <url value="https://fhir.nhs.uk/STU3/StructureDefinition/CareConnect-DCH-Weight-Observation-1"/>
   <version value="1.4.0"/>
   <name value="CareConnect-DCH-Weight-Observation-1"/>
   <status value="draft"/>
   <date value="2019-03-07"/>
   <publisher value="NHS Digital"/>
   <contact>
      <name value="Interoperability Team"/>
      <telecom>
         <system value="email"/>
         <value value="interoperabilityteam@nhs.net"/>
         <use value="work"/>
      </telecom>
   </contact>
   <description value="The Observation resource is used for tracking the current and historical observations that have been made for a patient with further contraints applied to represent a body weight observation, to support the Digital Child Health project."/>
   <copyright value="Copyright © 2019 NHS Digital"/>
   <fhirVersion value="3.0.1"/>
   <kind value="resource"/>
   <abstract value="false"/>
   <type value="Observation"/>
   <baseDefinition value="http://hl7.org/fhir/StructureDefinition/Observation"/>
   <derivation value="constraint"/>
   <snapshot>
      <element id="Observation">
         <path value="Observation"/>
         <short value="Measurements and simple assertions"/>
         <definition value="Measurements and simple assertions made about a patient, device or other subject."/>
         <comment value="Used for simple observations such as device measurements, laboratory atomic results, vital signs, height, weight, smoking status, comments, etc.  Other resources are used to provide context for observations such as lab reports, etc."/>
         <alias value="Vital Signs"/>
         <alias value="Measurement"/>
         <alias value="Results"/>
         <alias value="Tests"/>
         <min value="0"/>
         <max value="*"/>
         <base>
            <path value="Resource"/>
            <min value="0"/>
            <max value="*"/>
         </base>
         <constraint>
            <key value="dom-2"/>
            <severity value="error"/>
            <human value="If the resource is contained in another resource, it SHALL NOT contain nested Resources"/>
            <expression value="contained.contained.empty()"/>
            <xpath value="not(parent::f:contained and f:contained)"/>
         </constraint>
         <constraint>
            <key value="dom-1"/>
            <severity value="error"/>
            <human value="If the resource is contained in another resource, it SHALL NOT contain any narrative"/>
            <expression value="contained.text.empty()"/>
            <xpath value="not(parent::f:contained and f:text)"/>
         </constraint>
         <constraint>
            <key value="dom-4"/>
            <severity value="error"/>
            <human value="If a resource is contained in another resource, it SHALL NOT have a meta.versionId or a meta.lastUpdated"/>
            <expression value="contained.meta.versionId.empty() and contained.meta.lastUpdated.empty()"/>
            <xpath value="not(exists(f:contained/*/f:meta/f:versionId)) and not(exists(f:contained/*/f:meta/f:lastUpdated))"/>
         </constraint>
         <constraint>
            <key value="dom-3"/>
            <severity value="error"/>
            <human value="If the resource is contained in another resource, it SHALL be referred to from elsewhere in the resource"/>
            <expression value="contained.where(('#'+id in %resource.descendants().reference).not()).empty()"/>
            <xpath value="not(exists(for $id in f:contained/*/@id return $id[not(ancestor::f:contained/parent::*/descendant::f:reference/@value=concat('#', $id))]))"/>
         </constraint>
         <constraint>
            <key value="obs-7"/>
            <severity value="error"/>
            <human value="If code is the same as a component code then the value element associated with the code SHALL NOT be present"/>
            <expression value="value.empty() or code!=component.code"/>
            <xpath value="not(exists(f:*[starts-with(local-name(.), 'value')])) or not(count(for $coding in f:code/f:coding return parent::*/f:component/f:code/f:coding[f:code/@value=$coding/f:code/@value and f:system/@value=$coding/f:system/@value])=0)"/>
         </constraint>
         <constraint>
            <key value="obs-6"/>
            <severity value="error"/>
            <human value="dataAbsentReason SHALL only be present if Observation.value[x] is not present"/>
            <expression value="dataAbsentReason.empty() or value.empty()"/>
            <xpath value="not(exists(f:dataAbsentReason)) or (not(exists(*[starts-with(local-name(.), 'value')])))"/>
         </constraint>
         <mapping>
            <identity value="rim"/>
            <map value="Entity. Role, or Act"/>
         </mapping>
         <mapping>
            <identity value="workflow"/>
            <map value="Event"/>
         </mapping>
         <mapping>
            <identity value="sct-concept"/>
            <map value="< 363787002 |Observable entity|"/>
         </mapping>
         <mapping>
            <identity value="v2"/>
            <map value="OBX"/>
         </mapping>
         <mapping>
            <identity value="rim"/>
            <map value="Observation[classCode=OBS, moodCode=EVN]"/>
         </mapping>
         <mapping>
            <identity value="w5"/>
            <map value="clinical.diagnostics"/>
         </mapping>
      </element>
      <element id="Observation.id">
         <path value="Observation.id"/>
         <short value="Logical id of this artifact"/>
         <definition value="The logical id of the resource, as used in the URL for the resource. Once assigned, this value never changes."/>
         <comment value="The only time that a resource does not have an id is when it is being submitted to the server using a create operation."/>
         <min value="0"/>
         <max value="1"/>
         <base>
            <path value="Resource.id"/>
            <min value="0"/>
            <max value="1"/>
         </base>
         <type>
            <code value="id"/>
         </type>
         <condition value="ele-1"/>
         <constraint>
            <key value="ele-1"/>
            <severity value="error"/>
            <human value="All FHIR elements must have a @value or children"/>
            <expression value="hasValue() | (children().count() > id.count())"/>
            <xpath value="@value|f:*|h:div"/>
         </constraint>
         <isSummary value="true"/>
         <mapping>
            <identity value="rim"/>
            <map value="n/a"/>
         </mapping>
      </element>
      <element id="Observation.meta">
         <path value="Observation.meta"/>
         <short value="Metadata about the resource"/>
         <definition value="The metadata about the resource. This is content that is maintained by the infrastructure. Changes to the content may not always be associated with version changes to the resource."/>
         <min value="0"/>
         <max value="1"/>
         <base>
            <path value="Resource.meta"/>
            <min value="0"/>
            <max value="1"/>
         </base>
         <type>
            <code value="Meta"/>
         </type>
         <condition value="ele-1"/>
         <constraint>
            <key value="ele-1"/>
            <severity value="error"/>
            <human value="All FHIR elements must have a @value or children"/>
            <expression value="hasValue() | (children().count() > id.count())"/>
            <xpath value="@value|f:*|h:div"/>
         </constraint>
         <isSummary value="true"/>
         <mapping>
            <identity value="rim"/>
            <map value="n/a"/>
         </mapping>
         <mapping>
            <identity value="rim"/>
            <map value="N/A"/>
         </mapping>
      </element>
      <element id="Observation.implicitRules">
         <path value="Observation.implicitRules"/>
         <short value="A set of rules under which this content was created"/>
         <definition value="A reference to a set of rules that were followed when the resource was constructed, and which must be understood when processing the content."/>
         <comment value="Asserting this rule set restricts the content to be only understood by a limited set of trading partners. This inherently limits the usefulness of the data in the long term. However, the existing health eco-system is highly fractured, and not yet ready to define, collect, and exchange data in a generally computable sense. Wherever possible, implementers and/or specification writers should avoid using this element.   This element is labelled as a modifier because the implicit rules may provide additional knowledge about the resource that modifies it's meaning or interpretation."/>
         <min value="0"/>
         <max value="1"/>
         <base>
            <path value="Resource.implicitRules"/>
            <min value="0"/>
            <max value="1"/>
         </base>
         <type>
            <code value="uri"/>
         </type>
         <condition value="ele-1"/>
         <constraint>
            <key value="ele-1"/>
            <severity value="error"/>
            <human value="All FHIR elements must have a @value or children"/>
            <expression value="hasValue() | (children().count() > id.count())"/>
            <xpath value="@value|f:*|h:div"/>
         </constraint>
         <isModifier value="true"/>
         <isSummary value="true"/>
         <mapping>
            <identity value="rim"/>
            <map value="n/a"/>
         </mapping>
      </element>
      <element id="Observation.language">
         <path value="Observation.language"/>
         <short value="Language of the resource content"/>
         <definition value="The base language in which the resource is written."/>
         <comment value="Language is provided to support indexing and accessibility (typically, services such as text to speech use the language tag). The html language tag in the narrative applies  to the narrative. The language tag on the resource may be used to specify the language of other presentations generated from the data in the resource  Not all the content has to be in the base language. The Resource.language should not be assumed to apply to the narrative automatically. If a language is specified, it should it also be specified on the div element in the html (see rules in HTML5 for information about the relationship between xml:lang and the html lang attribute)."/>
         <min value="0"/>
         <max value="1"/>
         <base>
            <path value="Resource.language"/>
            <min value="0"/>
            <max value="1"/>
         </base>
         <type>
            <code value="code"/>
         </type>
         <condition value="ele-1"/>
         <constraint>
            <key value="ele-1"/>
            <severity value="error"/>
            <human value="All FHIR elements must have a @value or children"/>
            <expression value="hasValue() | (children().count() > id.count())"/>
            <xpath value="@value|f:*|h:div"/>
         </constraint>
         <binding>
            <extension url="http://hl7.org/fhir/StructureDefinition/elementdefinition-maxValueSet">
               <valueReference>
                  <reference value="http://hl7.org/fhir/ValueSet/all-languages"/>
               </valueReference>
            </extension>
            <extension url="http://hl7.org/fhir/StructureDefinition/elementdefinition-bindingName">
               <valueString value="Language"/>
            </extension>
            <extension url="http://hl7.org/fhir/StructureDefinition/elementdefinition-isCommonBinding">
               <valueBoolean value="true"/>
            </extension>
            <strength value="extensible"/>
            <description value="A human language."/>
            <valueSetReference>
               <reference value="http://hl7.org/fhir/ValueSet/languages"/>
            </valueSetReference>
         </binding>
         <mapping>
            <identity value="rim"/>
            <map value="n/a"/>
         </mapping>
      </element>
      <element id="Observation.text">
         <path value="Observation.text"/>
         <short value="Text summary of the resource, for human interpretation"/>
         <definition value="A human-readable narrative that contains a summary of the resource, and may be used to represent the content of the resource to a human. The narrative need not encode all the structured data, but is required to contain sufficient detail to make it "clinically safe" for a human to just read the narrative. Resource definitions may define what content should be represented in the narrative to ensure clinical safety."/>
         <comment value="Contained resources do not have narrative. Resources that are not contained SHOULD have a narrative. In some cases, a resource may only have text with little or no additional discrete data (as long as all minOccurs=1 elements are satisfied).  This may be necessary for data from legacy systems where information is captured as a "text blob" or where text is additionally entered raw or narrated and encoded in formation is added later."/>
         <alias value="narrative"/>
         <alias value="html"/>
         <alias value="xhtml"/>
         <alias value="display"/>
         <min value="0"/>
         <max value="1"/>
         <base>
            <path value="DomainResource.text"/>
            <min value="0"/>
            <max value="1"/>
         </base>
         <type>
            <code value="Narrative"/>
         </type>
         <condition value="ele-1"/>
         <condition value="dom-1"/>
         <constraint>
            <key value="ele-1"/>
            <severity value="error"/>
            <human value="All FHIR elements must have a @value or children"/>
            <expression value="hasValue() | (children().count() > id.count())"/>
            <xpath value="@value|f:*|h:div"/>
         </constraint>
         <mapping>
            <identity value="rim"/>
            <map value="n/a"/>
         </mapping>
         <mapping>
            <identity value="rim"/>
            <map value="N/A"/>
         </mapping>
         <mapping>
            <identity value="rim"/>
            <map value="Act.text?"/>
         </mapping>
      </element>
      <element id="Observation.contained">
         <path value="Observation.contained"/>
         <short value="Contained, inline Resources"/>
         <definition value="These resources do not have an independent existence apart from the resource that contains them - they cannot be identified independently, and nor can they have their own independent transaction scope."/>
         <comment value="This should never be done when the content can be identified properly, as once identification is lost, it is extremely difficult (and context dependent) to restore it again."/>
         <alias value="inline resources"/>
         <alias value="anonymous resources"/>
         <alias value="contained resources"/>
         <min value="0"/>
         <max value="*"/>
         <base>
            <path value="DomainResource.contained"/>
            <min value="0"/>
            <max value="*"/>
         </base>
         <type>
            <code value="Resource"/>
         </type>
         <mapping>
            <identity value="rim"/>
            <map value="Entity. Role, or Act"/>
         </mapping>
         <mapping>
            <identity value="rim"/>
            <map value="N/A"/>
         </mapping>
      </element>
      <element id="Observation.extension">
         <path value="Observation.extension"/>
         <slicing>
            <discriminator>
               <type value="value"/>
               <path value="url"/>
            </discriminator>
            <description value="Extensions are always sliced by (at least) url"/>
            <rules value="open"/>
         </slicing>
         <short value="Additional Content defined by implementations"/>
         <definition value="May be used to represent additional information that is not part of the basic definition of the resource. In order to make the use of extensions safe and manageable, there is a strict set of governance  applied to the definition and use of extensions. Though any implementer is allowed to define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension."/>
         <comment value="There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions.  The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone."/>
         <alias value="extensions"/>
         <alias value="user content"/>
         <min value="0"/>
         <max value="*"/>
         <base>
            <path value="DomainResource.extension"/>
            <min value="0"/>
            <max value="*"/>
         </base>
         <type>
            <code value="Extension"/>
         </type>
         <condition value="ele-1"/>
         <constraint>
            <key value="ele-1"/>
            <severity value="error"/>
            <human value="All FHIR elements must have a @value or children"/>
            <expression value="hasValue() | (children().count() > id.count())"/>
            <xpath value="@value|f:*|h:div"/>
         </constraint>
         <constraint>
            <key value="ext-1"/>
            <severity value="error"/>
            <human value="Must have either extensions or value[x], not both"/>
            <expression value="extension.exists() != value.exists()"/>
            <xpath value="exists(f:extension)!=exists(f:*[starts-with(local-name(.), 'value')])"/>
         </constraint>
         <mapping>
            <identity value="rim"/>
            <map value="n/a"/>
         </mapping>
         <mapping>
            <identity value="rim"/>
            <map value="N/A"/>
         </mapping>
      </element>
      <element id="Observation.extension:reason">
         <path value="Observation.extension"/>
         <sliceName value="reason"/>
         <short value="Additional Content defined by implementations"/>
         <definition value="May be used to represent additional information that is not part of the basic definition of the resource. In order to make the use of extensions safe and manageable, there is a strict set of governance  applied to the definition and use of extensions. Though any implementer is allowed to define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension."/>
         <comment value="There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions.  The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone."/>
         <alias value="extensions"/>
         <alias value="user content"/>
         <min value="0"/>
         <max value="0"/>
         <base>
            <path value="DomainResource.extension"/>
            <min value="0"/>
            <max value="*"/>
         </base>
         <type>
            <code value="Extension"/>
            <profile value="https://fhir.hl7.org.uk/STU3/StructureDefinition/Extension-CareConnect-ReasonCondition-1"/>
         </type>
         <condition value="ele-1"/>
         <constraint>
            <key value="ele-1"/>
            <severity value="error"/>
            <human value="All FHIR elements must have a @value or children"/>
            <expression value="hasValue() | (children().count() > id.count())"/>
            <xpath value="@value|f:*|h:div"/>
         </constraint>
         <constraint>
            <key value="ext-1"/>
            <severity value="error"/>
            <human value="Must have either extensions or value[x], not both"/>
            <expression value="extension.exists() != value.exists()"/>
            <xpath value="exists(f:extension)!=exists(f:*[starts-with(local-name(.), 'value')])"/>
         </constraint>
         <mapping>
            <identity value="rim"/>
            <map value="n/a"/>
         </mapping>
         <mapping>
            <identity value="rim"/>
            <map value="N/A"/>
         </mapping>
      </element>
      <element id="Observation.extension:reason.id">
         <path value="Observation.extension.id"/>
         <representation value="xmlAttr"/>
         <short value="xml:id (or equivalent in JSON)"/>
         <definition value="unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces."/>
         <comment value="Note that FHIR strings may not exceed 1MB in size"/>
         <min value="0"/>
         <max value="1"/>
         <base>
            <path value="Element.id"/>
            <min value="0"/>
            <max value="1"/>
         </base>
         <type>
            <code value="string"/>
         </type>
         <condition value="ele-1"/>
         <constraint>
            <key value="ele-1"/>
            <severity value="error"/>
            <human value="All FHIR elements must have a @value or children"/>
            <expression value="hasValue() | (children().count() > id.count())"/>
            <xpath value="@value|f:*|h:div"/>
         </constraint>
         <mapping>
            <identity value="rim"/>
            <map value="n/a"/>
         </mapping>
      </element>
      <element id="Observation.extension:reason.extension">
         <path value="Observation.extension.extension"/>
         <slicing>
            <discriminator>
               <type value="value"/>
               <path value="url"/>
            </discriminator>
            <description value="Extensions are always sliced by (at least) url"/>
            <rules value="open"/>
         </slicing>
         <short value="Additional Content defined by implementations"/>
         <definition value="May be used to represent additional information that is not part of the basic definition of the element. In order to make the use of extensions safe and manageable, there is a strict set of governance  applied to the definition and use of extensions. Though any implementer is allowed to define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension."/>
         <comment value="There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions.  The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone."/>
         <alias value="extensions"/>
         <alias value="user content"/>
         <min value="0"/>
         <max value="*"/>
         <base>
            <path value="Element.extension"/>
            <min value="0"/>
            <max value="*"/>
         </base>
         <type>
            <code value="Extension"/>
         </type>
         <condition value="ele-1"/>
         <constraint>
            <key value="ele-1"/>
            <severity value="error"/>
            <human value="All FHIR elements must have a @value or children"/>
            <expression value="hasValue() | (children().count() > id.count())"/>
            <xpath value="@value|f:*|h:div"/>
         </constraint>
         <constraint>
            <key value="ext-1"/>
            <severity value="error"/>
            <human value="Must have either extensions or value[x], not both"/>
            <expression value="extension.exists() != value.exists()"/>
            <xpath value="exists(f:extension)!=exists(f:*[starts-with(local-name(.), 'value')])"/>
         </constraint>
         <mapping>
            <identity value="rim"/>
            <map value="n/a"/>
         </mapping>
         <mapping>
            <identity value="rim"/>
            <map value="N/A"/>
         </mapping>
      </element>
      <element id="Observation.extension:reason.url">
         <path value="Observation.extension.url"/>
         <representation value="xmlAttr"/>
         <short value="identifies the meaning of the extension"/>
         <definition value="Source of the definition for the extension code - a logical name or a URL."/>
         <comment value="The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension."/>
         <min value="1"/>
         <max value="1"/>
         <base>
            <path value="Extension.url"/>
            <min value="1"/>
            <max value="1"/>
         </base>
         <type>
            <code value="uri"/>
         </type>
         <fixedUri value="https://fhir.hl7.org.uk/STU3/StructureDefinition/Extension-CareConnect-ReasonCondition-1"/>
         <condition value="ele-1"/>
         <constraint>
            <key value="ele-1"/>
            <severity value="error"/>
            <human value="All FHIR elements must have a @value or children"/>
            <expression value="hasValue() | (children().count() > id.count())"/>
            <xpath value="@value|f:*|h:div"/>
         </constraint>
         <mapping>
            <identity value="rim"/>
            <map value="n/a"/>
         </mapping>
         <mapping>
            <identity value="rim"/>
            <map value="N/A"/>
         </mapping>
      </element>
      <element id="Observation.extension:reason.value[x]">
         <path value="Observation.extension.value[x]"/>
         <short value="Value of extension"/>
         <definition value="Value of extension - may be a resource or one of a constrained set of the data types (see Extensibility in the spec for list)."/>
         <comment value="A stream of bytes, base64 encoded"/>
         <min value="0"/>
         <max value="1"/>
         <base>
            <path value="Extension.value[x]"/>
            <min value="0"/>
            <max value="1"/>
         </base>
         <type>
            <code value="base64Binary"/>
         </type>
         <type>
            <code value="boolean"/>
         </type>
         <type>
            <code value="code"/>
         </type>
         <type>
            <code value="date"/>
         </type>
         <type>
            <code value="dateTime"/>
         </type>
         <type>
            <code value="decimal"/>
         </type>
         <type>
            <code value="id"/>
         </type>
         <type>
            <code value="instant"/>
         </type>
         <type>
            <code value="integer"/>
         </type>
         <type>
            <code value="markdown"/>
         </type>
         <type>
            <code value="oid"/>
         </type>
         <type>
            <code value="positiveInt"/>
         </type>
         <type>
            <code value="string"/>
         </type>
         <type>
            <code value="time"/>
         </type>
         <type>
            <code value="unsignedInt"/>
         </type>
         <type>
            <code value="uri"/>
         </type>
         <type>
            <code value="Address"/>
         </type>
         <type>
            <code value="Age"/>
         </type>
         <type>
            <code value="Annotation"/>
         </type>
         <type>
            <code value="Attachment"/>
         </type>
         <type>
            <code value="CodeableConcept"/>
         </type>
         <type>
            <code value="Coding"/>
         </type>
         <type>
            <code value="ContactPoint"/>
         </type>
         <type>
            <code value="Count"/>
         </type>
         <type>
            <code value="Distance"/>
         </type>
         <type>
            <code value="Duration"/>
         </type>
         <type>
            <code value="HumanName"/>
         </type>
         <type>
            <code value="Identifier"/>
         </type>
         <type>
            <code value="Money"/>
         </type>
         <type>
            <code value="Period"/>
         </type>
         <type>
            <code value="Quantity"/>
         </type>
         <type>
            <code value="Range"/>
         </type>
         <type>
            <code value="Ratio"/>
         </type>
         <type>
            <code value="Reference"/>
         </type>
         <type>
            <code value="SampledData"/>
         </type>
         <type>
            <code value="Signature"/>
         </type>
         <type>
            <code value="Timing"/>
         </type>
         <type>
            <code value="Meta"/>
         </type>
         <condition value="ele-1"/>
         <constraint>
            <key value="ele-1"/>
            <severity value="error"/>
            <human value="All FHIR elements must have a @value or children"/>
            <expression value="hasValue() | (children().count() > id.count())"/>
            <xpath value="@value|f:*|h:div"/>
         </constraint>
         <mapping>
            <identity value="rim"/>
            <map value="n/a"/>
         </mapping>
         <mapping>
            <identity value="rim"/>
            <map value="N/A"/>
         </mapping>
      </element>
      <element id="Observation.modifierExtension">
         <path value="Observation.modifierExtension"/>
         <slicing>
            <discriminator>
               <type value="value"/>
               <path value="url"/>
            </discriminator>
            <description value="Extensions are always sliced by (at least) url"/>
            <rules value="open"/>
         </slicing>
         <short value="Extensions that cannot be ignored"/>
         <definition value="May be used to represent additional information that is not part of the basic definition of the resource, and that modifies the understanding of the element that contains it. Usually modifier elements provide negation or qualification. In order to make the use of extensions safe and manageable, there is a strict set of governance applied to the definition and use of extensions. Though any implementer is allowed to define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension. Applications processing a resource are required to check for modifier extensions."/>
         <comment value="There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions.  The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone."/>
         <alias value="extensions"/>
         <alias value="user content"/>
         <min value="0"/>
         <max value="*"/>
         <base>
            <path value="DomainResource.modifierExtension"/>
            <min value="0"/>
            <max value="*"/>
         </base>
         <type>
            <code value="Extension"/>
         </type>
         <condition value="ele-1"/>
         <constraint>
            <key value="ele-1"/>
            <severity value="error"/>
            <human value="All FHIR elements must have a @value or children"/>
            <expression value="hasValue() | (children().count() > id.count())"/>
            <xpath value="@value|f:*|h:div"/>
         </constraint>
         <constraint>
            <key value="ext-1"/>
            <severity value="error"/>
            <human value="Must have either extensions or value[x], not both"/>
            <expression value="extension.exists() != value.exists()"/>
            <xpath value="exists(f:extension)!=exists(f:*[starts-with(local-name(.), 'value')])"/>
         </constraint>
         <isModifier value="true"/>
         <mapping>
            <identity value="rim"/>
            <map value="n/a"/>
         </mapping>
         <mapping>
            <identity value="rim"/>
            <map value="N/A"/>
         </mapping>
      </element>
      <element id="Observation.identifier">
         <path value="Observation.identifier"/>
         <short value="Business Identifier for observation"/>
         <definition value="A unique identifier assigned to this observation."/>
         <requirements value="Allows observations to be distinguished and referenced."/>
         <min value="0"/>
         <max value="1"/>
         <base>
            <path value="Observation.identifier"/>
            <min value="0"/>
            <max value="*"/>
         </base>
         <type>
            <code value="Identifier"/>
         </type>
         <condition value="ele-1"/>
         <constraint>
            <key value="ele-1"/>
            <severity value="error"/>
            <human value="All FHIR elements must have a @value or children"/>
            <expression value="hasValue() | (children().count() > id.count())"/>
            <xpath value="@value|f:*|h:div"/>
         </constraint>
         <isSummary value="true"/>
         <mapping>
            <identity value="rim"/>
            <map value="n/a"/>
         </mapping>
         <mapping>
            <identity value="v2"/>
            <map value="CX / EI (occasionally, more often EI maps to a resource id or a URL)"/>
         </mapping>
         <mapping>
            <identity value="rim"/>
            <map value="II - see see identifier pattern at http://wiki.hl7.org/index.php?title=Common_Design_Patterns#Identifier_Pattern for relevant discussion. The Identifier class is a little looser than the v3 type II because it allows URIs as well as registered OIDs or GUIDs.  Also maps to Role[classCode=IDENT]"/>
         </mapping>
         <mapping>
            <identity value="servd"/>
            <map value="Identifier"/>
         </mapping>
         <mapping>
            <identity value="workflow"/>
            <map value="Event.identifier"/>
         </mapping>
         <mapping>
            <identity value="v2"/>
            <map value="OBX.21  For OBX segments from systems without OBX-21 support a combination of ORC/OBR and OBX must be negotiated between trading partners to uniquely identify the OBX segment. Depending on how V2 has been implemented each of these may be an option: 1) OBR-3 + OBX-3 + OBX-4 or 2) OBR-3 + OBR-4 + OBX-3 + OBX-4 or 2) some other way to uniquely ID the OBR/ORC + OBX-3 + OBX-4."/>
         </mapping>
         <mapping>
            <identity value="rim"/>
            <map value="id"/>
         </mapping>
         <mapping>
            <identity value="w5"/>
            <map value="id"/>
         </mapping>
      </element>
      <element id="Observation.identifier.id">
         <path value="Observation.identifier.id"/>
         <representation value="xmlAttr"/>
         <short value="xml:id (or equivalent in JSON)"/>
         <definition value="unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces."/>
         <comment value="Note that FHIR strings may not exceed 1MB in size"/>
         <min value="0"/>
         <max value="1"/>
         <base>
            <path value="Element.id"/>
            <min value="0"/>
            <max value="1"/>
         </base>
         <type>
            <code value="string"/>
         </type>
         <condition value="ele-1"/>
         <constraint>
            <key value="ele-1"/>
            <severity value="error"/>
            <human value="All FHIR elements must have a @value or children"/>
            <expression value="hasValue() | (children().count() > id.count())"/>
            <xpath value="@value|f:*|h:div"/>
         </constraint>
         <mapping>
            <identity value="rim"/>
            <map value="n/a"/>
         </mapping>
      </element>
      <element id="Observation.identifier.extension">
         <path value="Observation.identifier.extension"/>
         <slicing>
            <discriminator>
               <type value="value"/>
               <path value="url"/>
            </discriminator>
            <description value="Extensions are always sliced by (at least) url"/>
            <rules value="open"/>
         </slicing>
         <short value="Additional Content defined by implementations"/>
         <definition value="May be used to represent additional information that is not part of the basic definition of the element. In order to make the use of extensions safe and manageable, there is a strict set of governance  applied to the definition and use of extensions. Though any implementer is allowed to define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension."/>
         <comment value="There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions.  The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone."/>
         <alias value="extensions"/>
         <alias value="user content"/>
         <min value="0"/>
         <max value="*"/>
         <base>
            <path value="Element.extension"/>
            <min value="0"/>
            <max value="*"/>
         </base>
         <type>
            <code value="Extension"/>
         </type>
         <condition value="ele-1"/>
         <constraint>
            <key value="ele-1"/>
            <severity value="error"/>
            <human value="All FHIR elements must have a @value or children"/>
            <expression value="hasValue() | (children().count() > id.count())"/>
            <xpath value="@value|f:*|h:div"/>
         </constraint>
         <constraint>
            <key value="ext-1"/>
            <severity value="error"/>
            <human value="Must have either extensions or value[x], not both"/>
            <expression value="extension.exists() != value.exists()"/>
            <xpath value="exists(f:extension)!=exists(f:*[starts-with(local-name(.), 'value')])"/>
         </constraint>
         <mapping>
            <identity value="rim"/>
            <map value="n/a"/>
         </mapping>
         <mapping>
            <identity value="rim"/>
            <map value="N/A"/>
         </mapping>
      </element>
      <element id="Observation.identifier.use">
         <path value="Observation.identifier.use"/>
         <short value="usual | official | temp | secondary (If known)"/>
         <definition value="The purpose of this identifier."/>
         <comment value="This is labeled as "Is Modifier" because applications should not mistake a temporary id for a permanent one. Applications can assume that an identifier is permanent unless it explicitly says that it is temporary."/>
         <requirements value="Allows the appropriate identifier for a particular context of use to be selected from among a set of identifiers."/>
         <min value="0"/>
         <max value="1"/>
         <base>
            <path value="Identifier.use"/>
            <min value="0"/>
            <max value="1"/>
         </base>
         <type>
            <code value="code"/>
         </type>
         <condition value="ele-1"/>
         <constraint>
            <key value="ele-1"/>
            <severity value="error"/>
            <human value="All FHIR elements must have a @value or children"/>
            <expression value="hasValue() | (children().count() > id.count())"/>
            <xpath value="@value|f:*|h:div"/>
         </constraint>
         <isModifier value="true"/>
         <isSummary value="true"/>
         <binding>
            <extension url="http://hl7.org/fhir/StructureDefinition/elementdefinition-bindingName">
               <valueString value="IdentifierUse"/>
            </extension>
            <strength value="required"/>
            <description value="Identifies the purpose for this identifier, if known ."/>
            <valueSetReference>
               <reference value="http://hl7.org/fhir/ValueSet/identifier-use"/>
            </valueSetReference>
         </binding>
         <mapping>
            <identity value="rim"/>
            <map value="n/a"/>
         </mapping>
         <mapping>
            <identity value="v2"/>
            <map value="N/A"/>
         </mapping>
         <mapping>
            <identity value="rim"/>
            <map value="Role.code or implied by context"/>
         </mapping>
      </element>
      <element id="Observation.identifier.type">
         <path value="Observation.identifier.type"/>
         <short value="Description of identifier"/>
         <definition value="A coded type for the identifier that can be used to determine which identifier to use for a specific purpose."/>
         <comment value="This element deals only with general categories of identifiers.  It SHOULD not be used for codes that correspond 1..1 with the Identifier.system. Some identifiers may fall into multiple categories due to common usage.   Where the system is known, a type is unnecessary because the type is always part of the system definition. However systems often need to handle identifiers where the system is not known. There is not a 1:1 relationship between type and system, since many different systems have the same type."/>
         <requirements value="Allows users to make use of identifiers when the identifier system is not known."/>
         <min value="0"/>
         <max value="1"/>
         <base>
            <path value="Identifier.type"/>
            <min value="0"/>
            <max value="1"/>
         </base>
         <type>
            <code value="CodeableConcept"/>
         </type>
         <condition value="ele-1"/>
         <constraint>
            <key value="ele-1"/>
            <severity value="error"/>
            <human value="All FHIR elements must have a @value or children"/>
            <expression value="hasValue() | (children().count() > id.count())"/>
            <xpath value="@value|f:*|h:div"/>
         </constraint>
         <isSummary value="true"/>
         <binding>
            <extension url="http://hl7.org/fhir/StructureDefinition/elementdefinition-bindingName">
               <valueString value="IdentifierType"/>
            </extension>
            <extension url="http://hl7.org/fhir/StructureDefinition/elementdefinition-isCommonBinding">
               <valueBoolean value="true"/>
            </extension>
            <strength value="extensible"/>
            <description value="A coded type for an identifier that can be used to determine which identifier to use for a specific purpose."/>
            <valueSetReference>
               <reference value="http://hl7.org/fhir/ValueSet/identifier-type"/>
            </valueSetReference>
         </binding>
         <mapping>
            <identity value="rim"/>
            <map value="n/a"/>
         </mapping>
         <mapping>
            <identity value="v2"/>
            <map value="CE/CNE/CWE"/>
         </mapping>
         <mapping>
            <identity value="rim"/>
            <map value="CD"/>
         </mapping>
         <mapping>
            <identity value="orim"/>
            <map value="fhir:CodeableConcept rdfs:subClassOf dt:CD"/>
         </mapping>
         <mapping>
            <identity value="v2"/>
            <map value="CX.5"/>
         </mapping>
         <mapping>
            <identity value="rim"/>
            <map value="Role.code or implied by context"/>
         </mapping>
      </element>
      <element id="Observation.identifier.system">
         <path value="Observation.identifier.system"/>
         <short value="The namespace for the identifier value"/>
         <definition value="Establishes the namespace for the value - that is, a URL that describes a set values that are unique."/>
         <comment value="see http://en.wikipedia.org/wiki/Uniform_resource_identifier"/>
         <requirements value="There are many sets  of identifiers.  To perform matching of two identifiers, we need to know what set we're dealing with. The system identifies a particular set of unique identifiers."/>
         <min value="1"/>
         <max value="1"/>
         <base>
            <path value="Identifier.system"/>
            <min value="0"/>
            <max value="1"/>
         </base>
         <type>
            <code value="uri"/>
         </type>
         <example>
            <label value="General"/>
            <valueUri value="http://www.acme.com/identifiers/patient or urn:ietf:rfc:3986 if the Identifier.value itself is a full uri"/>
         </example>
         <condition value="ele-1"/>
         <constraint>
            <key value="ele-1"/>
            <severity value="error"/>
            <human value="All FHIR elements must have a @value or children"/>
            <expression value="hasValue() | (children().count() > id.count())"/>
            <xpath value="@value|f:*|h:div"/>
         </constraint>
         <isSummary value="true"/>
         <mapping>
            <identity value="rim"/>
            <map value="n/a"/>
         </mapping>
         <mapping>
            <identity value="v2"/>
            <map value="CX.4 / EI-2-4"/>
         </mapping>
         <mapping>
            <identity value="rim"/>
            <map value="II.root or Role.id.root"/>
         </mapping>
         <mapping>
            <identity value="servd"/>
            <map value="./IdentifierType"/>
         </mapping>
      </element>
      <element id="Observation.identifier.value">
         <path value="Observation.identifier.value"/>
         <short value="The value that is unique"/>
         <definition value="The portion of the identifier typically relevant to the user and which is unique within the context of the system."/>
         <comment value="If the value is a full URI, then the system SHALL be urn:ietf:rfc:3986.  The value's primary purpose is computational mapping.  As a result, it may be normalized for comparison purposes (e.g. removing non-significant whitespace, dashes, etc.)  A value formatted for human display can be conveyed using the [Rendered Value extension](extension-rendered-value.html)."/>
         <min value="1"/>
         <max value="1"/>
         <base>
            <path value="Identifier.value"/>
            <min value="0"/>
            <max value="1"/>
         </base>
         <type>
            <code value="string"/>
         </type>
         <example>
            <label value="General"/>
            <valueString value="123456"/>
         </example>
         <condition value="ele-1"/>
         <constraint>
            <key value="ele-1"/>
            <severity value="error"/>
            <human value="All FHIR elements must have a @value or children"/>
            <expression value="hasValue() | (children().count() > id.count())"/>
            <xpath value="@value|f:*|h:div"/>
         </constraint>
         <isSummary value="true"/>
         <mapping>
            <identity value="rim"/>
            <map value="n/a"/>
         </mapping>
         <mapping>
            <identity value="v2"/>
            <map value="CX.1 / EI.1"/>
         </mapping>
         <mapping>
            <identity value="rim"/>
            <map value="II.extension or II.root if system indicates OID or GUID (Or Role.id.extension or root)"/>
         </mapping>
         <mapping>
            <identity value="servd"/>
            <map value="./Value"/>
         </mapping>
      </element>
      <element id="Observation.identifier.period">
         <path value="Observation.identifier.period"/>
         <short value="Time period when id is/was valid for use"/>
         <definition value="Time period during which identifier is/was valid for use."/>
         <comment value="This is not a duration - that's a measure of time (a separate type), but a duration that occurs at a fixed value of time. A Period specifies a range of time; the context of use will specify whether the entire range applies (e.g. "the patient was an inpatient of the hospital for this time range") or one value from the range applies (e.g. "give to the patient between these two times"). If duration is required, specify the type as Interval|Duration."/>
         <min value="0"/>
         <max value="1"/>
         <base>
            <path value="Identifier.period"/>
            <min value="0"/>
            <max value="1"/>
         </base>
         <type>
            <code value="Period"/>
         </type>
         <condition value="ele-1"/>
         <constraint>
            <key value="ele-1"/>
            <severity value="error"/>
            <human value="All FHIR elements must have a @value or children"/>
            <expression value="hasValue() | (children().count() > id.count())"/>
            <xpath value="@value|f:*|h:div"/>
         </constraint>
         <constraint>
            <key value="per-1"/>
            <severity value="error"/>
            <human value="If present, start SHALL have a lower value than end"/>
            <expression value="start.empty() or end.empty() or (start <= end)"/>
            <xpath value="not(exists(f:start)) or not(exists(f:end)) or (f:start/@value <= f:end/@value)"/>
         </constraint>
         <isSummary value="true"/>
         <mapping>
            <identity value="rim"/>
            <map value="n/a"/>
         </mapping>
         <mapping>
            <identity value="v2"/>
            <map value="DR"/>
         </mapping>
         <mapping>
            <identity value="rim"/>
            <map value="IVL<TS>[lowClosed="true" and highClosed="true"] or URG<TS>[lowClosed="true" and highClosed="true"]"/>
         </mapping>
         <mapping>
            <identity value="v2"/>
            <map value="CX.7 + CX.8"/>
         </mapping>
         <mapping>
            <identity value="rim"/>
            <map value="Role.effectiveTime or implied by context"/>
         </mapping>
         <mapping>
            <identity value="servd"/>
            <map value="./StartDate and ./EndDate"/>
         </mapping>
      </element>
      <element id="Observation.identifier.assigner">
         <path value="Observation.identifier.assigner"/>
         <short value="Organization that issued id (may be just text)"/>
         <definition value="Organization that issued/manages the identifier."/>
         <comment value="The Identifier.assigner may omit the .reference element and only contain a .display element reflecting the name or other textual information about the assigning organization."/>
         <min value="0"/>
         <max value="1"/>
         <base>
            <path value="Identifier.assigner"/>
            <min value="0"/>
            <max value="1"/>
         </base>
         <type>
            <code value="Reference"/>
            <targetProfile value="https://fhir.hl7.org.uk/STU3/StructureDefinition/CareConnect-Organization-1"/>
         </type>
         <condition value="ele-1"/>
         <constraint>
            <key value="ele-1"/>
            <severity value="error"/>
            <human value="All FHIR elements must have a @value or children"/>
            <expression value="hasValue() | (children().count() > id.count())"/>
            <xpath value="@value|f:*|h:div"/>
         </constraint>
         <constraint>
            <key value="ref-1"/>
            <severity value="error"/>
            <human value="SHALL have a contained resource if a local reference is provided"/>
            <expression value="reference.startsWith('#').not() or (reference.substring(1).trace('url') in %resource.contained.id.trace('ids'))"/>
            <xpath value="not(starts-with(f:reference/@value, '#')) or exists(ancestor::*[self::f:entry or self::f:parameter]/f:resource/f:*/f:contained/f:*[f:id/@value=substring-after(current()/f:reference/@value, '#')]|/*/f:contained/f:*[f:id/@value=substring-after(current()/f:reference/@value, '#')])"/>
         </constraint>
         <isSummary value="true"/>
         <mapping>
            <identity value="rim"/>
            <map value="n/a"/>
         </mapping>
         <mapping>
            <identity value="rim"/>
            <map value="The target of a resource reference is a RIM entry point (Act, Role, or Entity)"/>
         </mapping>
         <mapping>
            <identity value="v2"/>
            <map value="CX.4 / (CX.4,CX.9,CX.10)"/>
         </mapping>
         <mapping>
            <identity value="rim"/>
            <map value="II.assigningAuthorityName but note that this is an improper use by the definition of the field.  Also Role.scoper"/>
         </mapping>
         <mapping>
            <identity value="servd"/>
            <map value="./IdentifierIssuingAuthority"/>
         </mapping>
      </element>
      <element id="Observation.basedOn">
         <path value="Observation.basedOn"/>
         <short value="Fulfills plan, proposal or order"/>
         <definition value="A plan, proposal or order that is fulfilled in whole or in part by this event."/>
         <comment value="References SHALL be a reference to an actual FHIR resource, and SHALL be resolveable (allowing for access control, temporary unavailability, etc). Resolution can be either by retrieval from the URL, or, where applicable by resource type, by treating an absolute reference as a canonical URL and looking it up in a local registry/repository."/>
         <requirements value="Allows tracing of authorization for the event and tracking whether proposals/recommendations were acted upon."/>
         <alias value="Fulfills"/>
         <min value="0"/>
         <max value="0"/>
         <base>
            <path value="Observation.basedOn"/>
            <min value="0"/>
            <max value="*"/>
         </base>
         <type>
            <code value="Reference"/>
            <targetProfile value="http://hl7.org/fhir/StructureDefinition/CarePlan"/>
         </type>
         <type>
            <code value="Reference"/>
            <targetProfile value="http://hl7.org/fhir/StructureDefinition/DeviceRequest"/>
         </type>
         <type>
            <code value="Reference"/>
            <targetProfile value="http://hl7.org/fhir/StructureDefinition/ImmunizationRecommendation"/>
         </type>
         <type>
            <code value="Reference"/>
            <targetProfile value="http://hl7.org/fhir/StructureDefinition/MedicationRequest"/>
         </type>
         <type>
            <code value="Reference"/>
            <targetProfile value="http://hl7.org/fhir/StructureDefinition/NutritionOrder"/>
         </type>
         <type>
            <code value="Reference"/>
            <targetProfile value="http://hl7.org/fhir/StructureDefinition/ProcedureRequest"/>
         </type>
         <type>
            <code value="Reference"/>
            <targetProfile value="http://hl7.org/fhir/StructureDefinition/ReferralRequest"/>
         </type>
         <condition value="ele-1"/>
         <constraint>
            <key value="ele-1"/>
            <severity value="error"/>
            <human value="All FHIR elements must have a @value or children"/>
            <expression value="hasValue() | (children().count() > id.count())"/>
            <xpath value="@value|f:*|h:div"/>
         </constraint>
         <constraint>
            <key value="ref-1"/>
            <severity value="error"/>
            <human value="SHALL have a contained resource if a local reference is provided"/>
            <expression value="reference.startsWith('#').not() or (reference.substring(1).trace('url') in %resource.contained.id.trace('ids'))"/>
            <xpath value="not(starts-with(f:reference/@value, '#')) or exists(ancestor::*[self::f:entry or self::f:parameter]/f:resource/f:*/f:contained/f:*[f:id/@value=substring-after(current()/f:reference/@value, '#')]|/*/f:contained/f:*[f:id/@value=substring-after(current()/f:reference/@value, '#')])"/>
         </constraint>
         <isSummary value="true"/>
         <mapping>
            <identity value="rim"/>
            <map value="n/a"/>
         </mapping>
         <mapping>
            <identity value="rim"/>
            <map value="The target of a resource reference is a RIM entry point (Act, Role, or Entity)"/>
         </mapping>
         <mapping>
            <identity value="workflow"/>
            <map value="Event.basedOn"/>
         </mapping>
         <mapping>
            <identity value="v2"/>
            <map value="ORC"/>
         </mapping>
         <mapping>
            <identity value="rim"/>
            <map value=".outboundRelationship[typeCode=FLFS].target"/>
         </mapping>
      </element>
      <element id="Observation.basedOn.id">
         <path value="Observation.basedOn.id"/>
         <representation value="xmlAttr"/>
         <short value="xml:id (or equivalent in JSON)"/>
         <definition value="unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces."/>
         <comment value="Note that FHIR strings may not exceed 1MB in size"/>
         <min value="0"/>
         <max value="1"/>
         <base>
            <path value="Element.id"/>
            <min value="0"/>
            <max value="1"/>
         </base>
         <type>
            <code value="string"/>
         </type>
         <condition value="ele-1"/>
         <constraint>
            <key value="ele-1"/>
            <severity value="error"/>
            <human value="All FHIR elements must have a @value or children"/>
            <expression value="hasValue() | (children().count() > id.count())"/>
            <xpath value="@value|f:*|h:div"/>
         </constraint>
         <mapping>
            <identity value="rim"/>
            <map value="n/a"/>
         </mapping>
      </element>
      <element id="Observation.basedOn.extension">
         <path value="Observation.basedOn.extension"/>
         <slicing>
            <discriminator>
               <type value="value"/>
               <path value="url"/>
            </discriminator>
            <description value="Extensions are always sliced by (at least) url"/>
            <rules value="open"/>
         </slicing>
         <short value="Additional Content defined by implementations"/>
         <definition value="May be used to represent additional information that is not part of the basic definition of the element. In order to make the use of extensions safe and manageable, there is a strict set of governance  applied to the definition and use of extensions. Though any implementer is allowed to define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension."/>
         <comment value="There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions.  The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone."/>
         <alias value="extensions"/>
         <alias value="user content"/>
         <min value="0"/>
         <max value="*"/>
         <base>
            <path value="Element.extension"/>
            <min value="0"/>
            <max value="*"/>
         </base>
         <type>
            <code value="Extension"/>
         </type>
         <condition value="ele-1"/>
         <constraint>
            <key value="ele-1"/>
            <severity value="error"/>
            <human value="All FHIR elements must have a @value or children"/>
            <expression value="hasValue() | (children().count() > id.count())"/>
            <xpath value="@value|f:*|h:div"/>
         </constraint>
         <constraint>
            <key value="ext-1"/>
            <severity value="error"/>
            <human value="Must have either extensions or value[x], not both"/>
            <expression value="extension.exists() != value.exists()"/>
            <xpath value="exists(f:extension)!=exists(f:*[starts-with(local-name(.), 'value')])"/>
         </constraint>
         <mapping>
            <identity value="rim"/>
            <map value="n/a"/>
         </mapping>
         <mapping>
            <identity value="rim"/>
            <map value="N/A"/>
         </mapping>
      </element>
      <element id="Observation.basedOn.reference">
         <path value="Observation.basedOn.reference"/>
         <short value="Literal reference, Relative, internal or absolute URL"/>
         <definition value="A reference to a location at which the other resource is found. The reference may be a relative reference, in which case it is relative to the service base URL, or an absolute URL that resolves to the location where the resource is found. The reference may be version specific or not. If the reference is not to a FHIR RESTful server, then it should be assumed to be version specific. Internal fragment references (start with '#') refer to contained resources."/>
         <comment value="Using absolute URLs provides a stable scalable approach suitable for a cloud/web context, while using relative/logical references provides a flexible approach suitable for use when trading across closed eco-system boundaries.   Absolute URLs do not need to point to a FHIR RESTful server, though this is the preferred approach. If the URL conforms to the structure "/[type]/[id]" then it should be assumed that the reference is to a FHIR RESTful server."/>
         <min value="0"/>
         <max value="1"/>
         <base>
            <path value="Reference.reference"/>
            <min value="0"/>
            <max value="1"/>
         </base>
         <type>
            <code value="string"/>
         </type>
         <condition value="ele-1"/>
         <condition value="ref-1"/>
         <constraint>
            <key value="ele-1"/>
            <severity value="error"/>
            <human value="All FHIR elements must have a @value or children"/>
            <expression value="hasValue() | (children().count() > id.count())"/>
            <xpath value="@value|f:*|h:div"/>
         </constraint>
         <isSummary value="true"/>
         <mapping>
            <identity value="rim"/>
            <map value="n/a"/>
         </mapping>
         <mapping>
            <identity value="rim"/>
            <map value="N/A"/>
         </mapping>
      </element>
      <element id="Observation.basedOn.identifier">
         <path value="Observation.basedOn.identifier"/>
         <short value="Logical reference, when literal reference is not known"/>
         <definition value="An identifier for the other resource. This is used when there is no way to reference the other resource directly, either because the entity is not available through a FHIR server, or because there is no way for the author of the resource to convert a known identifier to an actual location. There is no requirement that a Reference.identifier point to something that is actually exposed as a FHIR instance, but it SHALL point to a business concept that would be expected to be exposed as a FHIR instance, and that instance would need to be of a FHIR resource type allowed by the reference."/>
         <comment value="When an identifier is provided in place of a reference, any system processing the reference will only be able to resolve the identifier to a reference if it understands the business context in which the identifier is used. Sometimes this is global (e.g. a national identifier) but often it is not. For this reason, none of the useful mechanisms described for working with references (e.g. chaining, includes) are possible, nor should servers be expected to be able resolve the reference. Servers may accept an identifier based reference untouched, resolve it, and/or reject it - see CapabilityStatement.rest.resource.referencePolicy.   When both an identifier and a literal reference are provided, the literal reference is preferred. Applications processing the resource are allowed - but not required - to check that the identifier matches the literal reference  Applications converting a logical reference to a literal reference may choose to leave the logical reference present, or remove it."/>
         <min value="0"/>
         <max value="1"/>
         <base>
            <path value="Reference.identifier"/>
            <min value="0"/>
            <max value="1"/>
         </base>
         <type>
            <code value="Identifier"/>
         </type>
         <condition value="ele-1"/>
         <constraint>
            <key value="ele-1"/>
            <severity value="error"/>
            <human value="All FHIR elements must have a @value or children"/>
            <expression value="hasValue() | (children().count() > id.count())"/>
            <xpath value="@value|f:*|h:div"/>
         </constraint>
         <isSummary value="true"/>
         <mapping>
            <identity value="rim"/>
            <map value="n/a"/>
         </mapping>
         <mapping>
            <identity value="v2"/>
            <map value="CX / EI (occasionally, more often EI maps to a resource id or a URL)"/>
         </mapping>
         <mapping>
            <identity value="rim"/>
            <map value="II - see see identifier pattern at http://wiki.hl7.org/index.php?title=Common_Design_Patterns#Identifier_Pattern for relevant discussion. The Identifier class is a little looser than the v3 type II because it allows URIs as well as registered OIDs or GUIDs.  Also maps to Role[classCode=IDENT]"/>
         </mapping>
         <mapping>
            <identity value="servd"/>
            <map value="Identifier"/>
         </mapping>
         <mapping>
            <identity value="rim"/>
            <map value=".identifier"/>
         </mapping>
      </element>
      <element id="Observation.basedOn.display">
         <extension url="http://hl7.org/fhir/StructureDefinition/elementdefinition-translatable">
            <valueBoolean value="true"/>
         </extension>
         <path value="Observation.basedOn.display"/>
         <short value="Text alternative for the resource"/>
         <definition value="Plain text narrative that identifies the resource in addition to the resource reference."/>
         <comment value="This is generally not the same as the Resource.text of the referenced resource.  The purpose is to identify what's being referenced, not to fully describe it."/>
         <min value="0"/>
         <max value="1"/>
         <base>
            <path value="Reference.display"/>
            <min value="0"/>
            <max value="1"/>
         </base>
         <type>
            <code value="string"/>
         </type>
         <condition value="ele-1"/>
         <constraint>
            <key value="ele-1"/>
            <severity value="error"/>
            <human value="All FHIR elements must have a @value or children"/>
            <expression value="hasValue() | (children().count() > id.count())"/>
            <xpath value="@value|f:*|h:div"/>
         </constraint>
         <isSummary value="true"/>
         <mapping>
            <identity value="rim"/>
            <map value="n/a"/>
         </mapping>
         <mapping>
            <identity value="rim"/>
            <map value="N/A"/>
         </mapping>
      </element>
      <element id="Observation.status">
         <extension url="http://hl7.org/fhir/StructureDefinition/structuredefinition-display-hint">
            <valueString value="default: final"/>
         </extension>
         <path value="Observation.status"/>
         <short value="registered | preliminary | final | amended +"/>
         <definition value="The status of the result value."/>
         <comment value="This element is labeled as a modifier because the status contains codes that mark the resource as not currently valid."/>
         <requirements value="Need to track the status of individual results. Some results are finalized before the whole report is finalized."/>
         <min value="1"/>
         <max value="1"/>
         <base>
            <path value="Observation.status"/>
            <min value="1"/>
            <max value="1"/>
         </base>
         <type>
            <code value="code"/>
         </type>
         <condition value="ele-1"/>
         <constraint>
            <key value="ele-1"/>
            <severity value="error"/>
            <human value="All FHIR elements must have a @value or children"/>
            <expression value="hasValue() | (children().count() > id.count())"/>
            <xpath value="@value|f:*|h:div"/>
         </constraint>
         <isModifier value="true"/>
         <isSummary value="true"/>
         <binding>
            <extension url="http://hl7.org/fhir/StructureDefinition/elementdefinition-bindingName">
               <valueString value="ObservationStatus"/>
            </extension>
            <strength value="required"/>
            <description value="Codes providing the status of an observation."/>
            <valueSetReference>
               <reference value="http://hl7.org/fhir/ValueSet/observation-status"/>
            </valueSetReference>
         </binding>
         <mapping>
            <identity value="rim"/>
            <map value="n/a"/>
         </mapping>
         <mapping>
            <identity value="workflow"/>
            <map value="Event.status"/>
         </mapping>
         <mapping>
            <identity value="sct-concept"/>
            <map value="< 445584004 |Report by finality status|"/>
         </mapping>
         <mapping>
            <identity value="v2"/>
            <map value="OBX-11"/>
         </mapping>
         <mapping>
            <identity value="rim"/>
            <map value="status  Amended & Final are differentiated by whether it is the subject of a ControlAct event with a type of "revise""/>
         </mapping>
         <mapping>
            <identity value="w5"/>
            <map value="status"/>
         </mapping>
      </element>
      <element id="Observation.category">
         <path value="Observation.category"/>
         <short value="Classification of  type of observation"/>
         <definition value="A code that classifies the general type of observation being made."/>
         <comment value="In addition to the required category valueset, this element allows various categorization schemes based on the owner’s definition of the category and effectively multiple categories can be used at once.  The level of granularity is defined by the category concepts in the value set."/>
         <requirements value="Used for filtering what observations are retrieved and displayed."/>
         <min value="1"/>
         <max value="1"/>
         <base>
            <path value="Observation.category"/>
            <min value="0"/>
            <max value="*"/>
         </base>
         <type>
            <code value="CodeableConcept"/>
         </type>
         <condition value="ele-1"/>
         <constraint>
            <key value="ele-1"/>
            <severity value="error"/>
            <human value="All FHIR elements must have a @value or children"/>
            <expression value="hasValue() | (children().count() > id.count())"/>
            <xpath value="@value|f:*|h:div"/>
         </constraint>
         <binding>
            <extension url="http://hl7.org/fhir/StructureDefinition/elementdefinition-bindingName">
               <valueString value="ObservationCategory"/>
            </extension>
            <strength value="preferred"/>
            <description value="Codes for high level observation categories."/>
            <valueSetReference>
               <reference value="http://hl7.org/fhir/ValueSet/observation-category"/>
            </valueSetReference>
         </binding>
         <mapping>
            <identity value="rim"/>
            <map value="n/a"/>
         </mapping>
         <mapping>
            <identity value="v2"/>
            <map value="CE/CNE/CWE"/>
         </mapping>
         <mapping>
            <identity value="rim"/>
            <map value="CD"/>
         </mapping>
         <mapping>
            <identity value="orim"/>
            <map value="fhir:CodeableConcept rdfs:subClassOf dt:CD"/>
         </mapping>
         <mapping>
            <identity value="rim"/>
            <map value=".outboundRelationship[typeCode="COMP].target[classCode="LIST", moodCode="EVN"].code"/>
         </mapping>
         <mapping>
            <identity value="w5"/>
            <map value="class"/>
         </mapping>
      </element>
      <element id="Observation.category.id">
         <path value="Observation.category.id"/>
         <representation value="xmlAttr"/>
         <short value="xml:id (or equivalent in JSON)"/>
         <definition value="unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces."/>
         <comment value="Note that FHIR strings may not exceed 1MB in size"/>
         <min value="0"/>
         <max value="1"/>
         <base>
            <path value="Element.id"/>
            <min value="0"/>
            <max value="1"/>
         </base>
         <type>
            <code value="string"/>
         </type>
         <condition value="ele-1"/>
         <constraint>
            <key value="ele-1"/>
            <severity value="error"/>
            <human value="All FHIR elements must have a @value or children"/>
            <expression value="hasValue() | (children().count() > id.count())"/>
            <xpath value="@value|f:*|h:div"/>
         </constraint>
         <mapping>
            <identity value="rim"/>
            <map value="n/a"/>
         </mapping>
      </element>
      <element id="Observation.category.extension">
         <path value="Observation.category.extension"/>
         <slicing>
            <discriminator>
               <type value="value"/>
               <path value="url"/>
            </discriminator>
            <description value="Extensions are always sliced by (at least) url"/>
            <rules value="open"/>
         </slicing>
         <short value="Additional Content defined by implementations"/>
         <definition value="May be used to represent additional information that is not part of the basic definition of the element. In order to make the use of extensions safe and manageable, there is a strict set of governance  applied to the definition and use of extensions. Though any implementer is allowed to define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension."/>
         <comment value="There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions.  The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone."/>
         <alias value="extensions"/>
         <alias value="user content"/>
         <min value="0"/>
         <max value="*"/>
         <base>
            <path value="Element.extension"/>
            <min value="0"/>
            <max value="*"/>
         </base>
         <type>
            <code value="Extension"/>
         </type>
         <condition value="ele-1"/>
         <constraint>
            <key value="ele-1"/>
            <severity value="error"/>
            <human value="All FHIR elements must have a @value or children"/>
            <expression value="hasValue() | (children().count() > id.count())"/>
            <xpath value="@value|f:*|h:div"/>
         </constraint>
         <constraint>
            <key value="ext-1"/>
            <severity value="error"/>
            <human value="Must have either extensions or value[x], not both"/>
            <expression value="extension.exists() != value.exists()"/>
            <xpath value="exists(f:extension)!=exists(f:*[starts-with(local-name(.), 'value')])"/>
         </constraint>
         <mapping>
            <identity value="rim"/>
            <map value="n/a"/>
         </mapping>
         <mapping>
            <identity value="rim"/>
            <map value="N/A"/>
         </mapping>
      </element>
      <element id="Observation.category.coding">
         <path value="Observation.category.coding"/>
         <slicing>
            <discriminator>
               <type value="value"/>
               <path value="system"/>
            </discriminator>
            <ordered value="false"/>
            <rules value="open"/>
         </slicing>
         <short value="Code defined by a terminology system"/>
         <definition value="A reference to a code defined by a terminology system."/>
         <comment value="Codes may be defined very casually in enumerations, or code lists, up to very formal definitions such as SNOMED CT - see the HL7 v3 Core Principles for more information.  Ordering of codings is undefined and SHALL NOT be used to infer meaning. Generally, at most only one of the coding values will be labeled as UserSelected = true."/>
         <requirements value="Allows for translations and alternate encodings within a code system.  Also supports communication of the same instance to systems requiring different encodings."/>
         <min value="1"/>
         <max value="*"/>
         <base>
            <path value="CodeableConcept.coding"/>
            <min value="0"/>
            <max value="*"/>
         </base>
         <type>
            <code value="Coding"/>
         </type>
         <condition value="ele-1"/>
         <constraint>
            <key value="ele-1"/>
            <severity value="error"/>
            <human value="All FHIR elements must have a @value or children"/>
            <expression value="hasValue() | (children().count() > id.count())"/>
            <xpath value="@value|f:*|h:div"/>
         </constraint>
         <isSummary value="true"/>
         <mapping>
            <identity value="rim"/>
            <map value="n/a"/>
         </mapping>
         <mapping>
            <identity value="v2"/>
            <map value="CE/CNE/CWE subset one of the sets of component 1-3 or 4-6"/>
         </mapping>
         <mapping>
            <identity value="rim"/>
            <map value="CV"/>
         </mapping>
         <mapping>
            <identity value="orim"/>
            <map value="fhir:Coding rdfs:subClassOf dt:CDCoding"/>
         </mapping>
         <mapping>
            <identity value="v2"/>
            <map value="C*E.1-8, C*E.10-22"/>
         </mapping>
         <mapping>
            <identity value="rim"/>
            <map value="union(., ./translation)"/>
         </mapping>
         <mapping>
            <identity value="orim"/>
            <map value="fhir:CodeableConcept.coding rdfs:subPropertyOf dt:CD.coding"/>
         </mapping>
      </element>
      <element id="Observation.category.coding:observationCategory">
         <path value="Observation.category.coding"/>
         <sliceName value="observationCategory"/>
         <short value="Code defined by a terminology system"/>
         <definition value="A reference to a code defined by a terminology system."/>
         <comment value="Codes may be defined very casually in enumerations, or code lists, up to very formal definitions such as SNOMED CT - see the HL7 v3 Core Principles for more information.  Ordering of codings is undefined and SHALL NOT be used to infer meaning. Generally, at most only one of the coding values will be labeled as UserSelected = true."/>
         <requirements value="Allows for translations and alternate encodings within a code system.  Also supports communication of the same instance to systems requiring different encodings."/>
         <min value="1"/>
         <max value="1"/>
         <base>
            <path value="CodeableConcept.coding"/>
            <min value="0"/>
            <max value="*"/>
         </base>
         <type>
            <code value="Coding"/>
         </type>
         <condition value="ele-1"/>
         <constraint>
            <key value="ele-1"/>
            <severity value="error"/>
            <human value="All FHIR elements must have a @value or children"/>
            <expression value="hasValue() | (children().count() > id.count())"/>
            <xpath value="@value|f:*|h:div"/>
         </constraint>
         <isSummary value="true"/>
         <mapping>
            <identity value="rim"/>
            <map value="n/a"/>
         </mapping>
         <mapping>
            <identity value="v2"/>
            <map value="CE/CNE/CWE subset one of the sets of component 1-3 or 4-6"/>
         </mapping>
         <mapping>
            <identity value="rim"/>
            <map value="CV"/>
         </mapping>
         <mapping>
            <identity value="orim"/>
            <map value="fhir:Coding rdfs:subClassOf dt:CDCoding"/>
         </mapping>
         <mapping>
            <identity value="v2"/>
            <map value="C*E.1-8, C*E.10-22"/>
         </mapping>
         <mapping>
            <identity value="rim"/>
            <map value="union(., ./translation)"/>
         </mapping>
         <mapping>
            <identity value="orim"/>
            <map value="fhir:CodeableConcept.coding rdfs:subPropertyOf dt:CD.coding"/>
         </mapping>
      </element>
      <element id="Observation.category.coding:observationCategory.id">
         <path value="Observation.category.coding.id"/>
         <representation value="xmlAttr"/>
         <short value="xml:id (or equivalent in JSON)"/>
         <definition value="unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces."/>
         <comment value="Note that FHIR strings may not exceed 1MB in size"/>
         <min value="0"/>
         <max value="1"/>
         <base>
            <path value="Element.id"/>
            <min value="0"/>
            <max value="1"/>
         </base>
         <type>
            <code value="string"/>
         </type>
         <condition value="ele-1"/>
         <constraint>
            <key value="ele-1"/>
            <severity value="error"/>
            <human value="All FHIR elements must have a @value or children"/>
            <expression value="hasValue() | (children().count() > id.count())"/>
            <xpath value="@value|f:*|h:div"/>
         </constraint>
         <mapping>
            <identity value="rim"/>
            <map value="n/a"/>
         </mapping>
      </element>
      <element id="Observation.category.coding:observationCategory.extension">
         <path value="Observation.category.coding.extension"/>
         <slicing>
            <discriminator>
               <type value="value"/>
               <path value="url"/>
            </discriminator>
            <description value="Extensions are always sliced by (at least) url"/>
            <rules value="open"/>
         </slicing>
         <short value="Additional Content defined by implementations"/>
         <definition value="May be used to represent additional information that is not part of the basic definition of the element. In order to make the use of extensions safe and manageable, there is a strict set of governance  applied to the definition and use of extensions. Though any implementer is allowed to define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension."/>
         <comment value="There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions.  The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone."/>
         <alias value="extensions"/>
         <alias value="user content"/>
         <min value="0"/>
         <max value="*"/>
         <base>
            <path value="Element.extension"/>
            <min value="0"/>
            <max value="*"/>
         </base>
         <type>
            <code value="Extension"/>
         </type>
         <condition value="ele-1"/>
         <constraint>
            <key value="ele-1"/>
            <severity value="error"/>
            <human value="All FHIR elements must have a @value or children"/>
            <expression value="hasValue() | (children().count() > id.count())"/>
            <xpath value="@value|f:*|h:div"/>
         </constraint>
         <constraint>
            <key value="ext-1"/>
            <severity value="error"/>
            <human value="Must have either extensions or value[x], not both"/>
            <expression value="extension.exists() != value.exists()"/>
            <xpath value="exists(f:extension)!=exists(f:*[starts-with(local-name(.), 'value')])"/>
         </constraint>
         <mapping>
            <identity value="rim"/>
            <map value="n/a"/>
         </mapping>
         <mapping>
            <identity value="rim"/>
            <map value="N/A"/>
         </mapping>
      </element>
      <element id="Observation.category.coding:observationCategory.system">
         <path value="Observation.category.coding.system"/>
         <short value="Identity of the terminology system"/>
         <definition value="The identification of the code system that defines the meaning of the symbol in the code."/>
         <comment value="The URI may be an OID (urn:oid:...) or a UUID (urn:uuid:...).  OIDs and UUIDs SHALL be references to the HL7 OID registry. Otherwise, the URI should come from HL7's list of FHIR defined special URIs or it should de-reference to some definition that establish the system clearly and unambiguously."/>
         <requirements value="Need to be unambiguous about the source of the definition of the symbol."/>
         <min value="1"/>
         <max value="1"/>
         <base>
            <path value="Coding.system"/>
            <min value="0"/>
            <max value="1"/>
         </base>
         <type>
            <code value="uri"/>
         </type>
         <fixedUri value="http://hl7.org/fhir/observation-category"/>
         <condition value="ele-1"/>
         <constraint>
            <key value="ele-1"/>
            <severity value="error"/>
            <human value="All FHIR elements must have a @value or children"/>
            <expression value="hasValue() | (children().count() > id.count())"/>
            <xpath value="@value|f:*|h:div"/>
         </constraint>
         <isSummary value="true"/>
         <mapping>
            <identity value="rim"/>
            <map value="n/a"/>
         </mapping>
         <mapping>
            <identity value="v2"/>
            <map value="C*E.3"/>
         </mapping>
         <mapping>
            <identity value="rim"/>
            <map value="./codeSystem"/>
         </mapping>
         <mapping>
            <identity value="orim"/>
            <map value="fhir:Coding.system rdfs:subPropertyOf dt:CDCoding.codeSystem"/>
         </mapping>
      </element>
      <element id="Observation.category.coding:observationCategory.version">
         <path value="Observation.category.coding.version"/>
         <short value="Version of the system - if relevant"/>
         <definition value="The version of the code system which was used when choosing this code. Note that a well-maintained code system does not need the version reported, because the meaning of codes is consistent across versions. However this cannot consistently be assured. and when the meaning is not guaranteed to be consistent, the version SHOULD be exchanged."/>
         <comment value="Where the terminology does not clearly define what string should be used to identify code system versions, the recommendation is to use the date (expressed in FHIR date format) on which that version was officially published as the version date."/>
         <min value="0"/>
         <max value="0"/>
         <base>
            <path value="Coding.version"/>
            <min value="0"/>
            <max value="1"/>
         </base>
         <type>
            <code value="string"/>
         </type>
         <condition value="ele-1"/>
         <constraint>
            <key value="ele-1"/>
            <severity value="error"/>
            <human value="All FHIR elements must have a @value or children"/>
            <expression value="hasValue() | (children().count() > id.count())"/>
            <xpath value="@value|f:*|h:div"/>
         </constraint>
         <isSummary value="true"/>
         <mapping>
            <identity value="rim"/>
            <map value="n/a"/>
         </mapping>
         <mapping>
            <identity value="v2"/>
            <map value="C*E.7"/>
         </mapping>
         <mapping>
            <identity value="rim"/>
            <map value="./codeSystemVersion"/>
         </mapping>
         <mapping>
            <identity value="orim"/>
            <map value="fhir:Coding.version rdfs:subPropertyOf dt:CDCoding.codeSystemVersion"/>
         </mapping>
      </element>
      <element id="Observation.category.coding:observationCategory.code">
         <path value="Observation.category.coding.code"/>
         <short value="Symbol in syntax defined by the system"/>
         <definition value="A symbol in syntax defined by the system. The symbol may be a predefined code or an expression in a syntax defined by the coding system (e.g. post-coordination)."/>
         <comment value="Note that FHIR strings may not exceed 1MB in size"/>
         <requirements value="Need to refer to a particular code in the system."/>
         <min value="1"/>
         <max value="1"/>
         <base>
            <path value="Coding.code"/>
            <min value="0"/>
            <max value="1"/>
         </base>
         <type>
            <code value="code"/>
         </type>
         <fixedCode value="vital-signs"/>
         <condition value="ele-1"/>
         <constraint>
            <key value="ele-1"/>
            <severity value="error"/>
            <human value="All FHIR elements must have a @value or children"/>
            <expression value="hasValue() | (children().count() > id.count())"/>
            <xpath value="@value|f:*|h:div"/>
         </constraint>
         <isSummary value="true"/>
         <mapping>
            <identity value="rim"/>
            <map value="n/a"/>
         </mapping>
         <mapping>
            <identity value="v2"/>
            <map value="C*E.1"/>
         </mapping>
         <mapping>
            <identity value="rim"/>
            <map value="./code"/>
         </mapping>
         <mapping>
            <identity value="orim"/>
            <map value="fhir:Coding.code rdfs:subPropertyOf dt:CDCoding.code"/>
         </mapping>
      </element>
      <element id="Observation.category.coding:observationCategory.display">
         <extension url="http://hl7.org/fhir/StructureDefinition/elementdefinition-translatable">
            <valueBoolean value="true"/>
         </extension>
         <path value="Observation.category.coding.display"/>
         <short value="Representation defined by the system"/>
         <definition value="A representation of the meaning of the code in the system, following the rules of the system."/>
         <comment value="Note that FHIR strings may not exceed 1MB in size"/>
         <requirements value="Need to be able to carry a human-readable meaning of the code for readers that do not know  the system."/>
         <min value="0"/>
         <max value="1"/>
         <base>
            <path value="Coding.display"/>
            <min value="0"/>
            <max value="1"/>
         </base>
         <type>
            <code value="string"/>
         </type>
         <condition value="ele-1"/>
         <constraint>
            <key value="ele-1"/>
            <severity value="error"/>
            <human value="All FHIR elements must have a @value or children"/>
            <expression value="hasValue() | (children().count() > id.count())"/>
            <xpath value="@value|f:*|h:div"/>
         </constraint>
         <isSummary value="true"/>
         <mapping>
            <identity value="rim"/>
            <map value="n/a"/>
         </mapping>
         <mapping>
            <identity value="v2"/>
            <map value="C*E.2 - but note this is not well followed"/>
         </mapping>
         <mapping>
            <identity value="rim"/>
            <map value="CV.displayName"/>
         </mapping>
         <mapping>
            <identity value="orim"/>
            <map value="fhir:Coding.display rdfs:subPropertyOf dt:CDCoding.displayName"/>
         </mapping>
      </element>
      <element id="Observation.category.coding:observationCategory.userSelected">
         <path value="Observation.category.coding.userSelected"/>
         <short value="If this coding was chosen directly by the user"/>
         <definition value="Indicates that this coding was chosen by a user directly - i.e. off a pick list of available items (codes or displays)."/>
         <comment value="Amongst a set of alternatives, a directly chosen code is the most appropriate starting point for new translations. There is some ambiguity about what exactly 'directly chosen' implies, and trading partner agreement may be needed to clarify the use of this element and its consequences more completely."/>
         <requirements value="This has been identified as a clinical safety criterium - that this exact system/code pair was chosen explicitly, rather than inferred by the system based on some rules or language processing."/>
         <min value="0"/>
         <max value="0"/>
         <base>
            <path value="Coding.userSelected"/>
            <min value="0"/>
            <max value="1"/>
         </base>
         <type>
            <code value="boolean"/>
         </type>
         <condition value="ele-1"/>
         <constraint>
            <key value="ele-1"/>
            <severity value="error"/>
            <human value="All FHIR elements must have a @value or children"/>
            <expression value="hasValue() | (children().count() > id.count())"/>
            <xpath value="@value|f:*|h:div"/>
         </constraint>
         <isSummary value="true"/>
         <mapping>
            <identity value="rim"/>
            <map value="n/a"/>
         </mapping>
         <mapping>
            <identity value="v2"/>
            <map value="Sometimes implied by being first"/>
         </mapping>
         <mapping>
            <identity value="rim"/>
            <map value="CD.codingRationale"/>
         </mapping>
         <mapping>
            <identity value="orim"/>
            <map value="fhir:Coding.userSelected fhir:mapsTo dt:CDCoding.codingRationale. fhir:Coding.userSelected fhir:hasMap fhir:Coding.userSelected.map. fhir:Coding.userSelected.map a fhir:Map;   fhir:target dt:CDCoding.codingRationale. fhir:Coding.userSelected\#true a [     fhir:source "true";     fhir:target dt:CDCoding.codingRationale\#O   ]"/>
         </mapping>
      </element>
      <element id="Observation.category.coding:snomedCT">
         <path value="Observation.category.coding"/>
         <sliceName value="snomedCT"/>
         <short value="Code defined by a terminology system"/>
         <definition value="A reference to a code defined by a terminology system."/>
         <comment value="Codes may be defined very casually in enumerations, or code lists, up to very formal definitions such as SNOMED CT - see the HL7 v3 Core Principles for more information.  Ordering of codings is undefined and SHALL NOT be used to infer meaning. Generally, at most only one of the coding values will be labeled as UserSelected = true."/>
         <requirements value="Allows for translations and alternate encodings within a code system.  Also supports communication of the same instance to systems requiring different encodings."/>
         <min value="0"/>
         <max value="1"/>
         <base>
            <path value="CodeableConcept.coding"/>
            <min value="0"/>
            <max value="*"/>
         </base>
         <type>
            <code value="Coding"/>
         </type>
         <condition value="ele-1"/>
         <constraint>
            <key value="ele-1"/>
            <severity value="error"/>
            <human value="All FHIR elements must have a @value or children"/>
            <expression value="hasValue() | (children().count() > id.count())"/>
            <xpath value="@value|f:*|h:div"/>
         </constraint>
         <isSummary value="true"/>
         <mapping>
            <identity value="rim"/>
            <map value="n/a"/>
         </mapping>
         <mapping>
            <identity value="v2"/>
            <map value="CE/CNE/CWE subset one of the sets of component 1-3 or 4-6"/>
         </mapping>
         <mapping>
            <identity value="rim"/>
            <map value="CV"/>
         </mapping>
         <mapping>
            <identity value="orim"/>
            <map value="fhir:Coding rdfs:subClassOf dt:CDCoding"/>
         </mapping>
         <mapping>
            <identity value="v2"/>
            <map value="C*E.1-8, C*E.10-22"/>
         </mapping>
         <mapping>
            <identity value="rim"/>
            <map value="union(., ./translation)"/>
         </mapping>
         <mapping>
            <identity value="orim"/>
            <map value="fhir:CodeableConcept.coding rdfs:subPropertyOf dt:CD.coding"/>
         </mapping>
      </element>
      <element id="Observation.category.coding:snomedCT.id">
         <path value="Observation.category.coding.id"/>
         <representation value="xmlAttr"/>
         <short value="xml:id (or equivalent in JSON)"/>
         <definition value="unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces."/>
         <comment value="Note that FHIR strings may not exceed 1MB in size"/>
         <min value="0"/>
         <max value="1"/>
         <base>
            <path value="Element.id"/>
            <min value="0"/>
            <max value="1"/>
         </base>
         <type>
            <code value="string"/>
         </type>
         <condition value="ele-1"/>
         <constraint>
            <key value="ele-1"/>
            <severity value="error"/>
            <human value="All FHIR elements must have a @value or children"/>
            <expression value="hasValue() | (children().count() > id.count())"/>
            <xpath value="@value|f:*|h:div"/>
         </constraint>
         <mapping>
            <identity value="rim"/>
            <map value="n/a"/>
         </mapping>
      </element>
      <element id="Observation.category.coding:snomedCT.extension">
         <path value="Observation.category.coding.extension"/>
         <slicing>
            <discriminator>
               <type value="value"/>
               <path value="url"/>
            </discriminator>
            <description value="Extensions are always sliced by (at least) url"/>
            <rules value="open"/>
         </slicing>
         <short value="Additional Content defined by implementations"/>
         <definition value="May be used to represent additional information that is not part of the basic definition of the element. In order to make the use of extensions safe and manageable, there is a strict set of governance  applied to the definition and use of extensions. Though any implementer is allowed to define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension."/>
         <comment value="There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions.  The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone."/>
         <alias value="extensions"/>
         <alias value="user content"/>
         <min value="0"/>
         <max value="*"/>
         <base>
            <path value="Element.extension"/>
            <min value="0"/>
            <max value="*"/>
         </base>
         <type>
            <code value="Extension"/>
         </type>
         <condition value="ele-1"/>
         <constraint>
            <key value="ele-1"/>
            <severity value="error"/>
            <human value="All FHIR elements must have a @value or children"/>
            <expression value="hasValue() | (children().count() > id.count())"/>
            <xpath value="@value|f:*|h:div"/>
         </constraint>
         <constraint>
            <key value="ext-1"/>
            <severity value="error"/>
            <human value="Must have either extensions or value[x], not both"/>
            <expression value="extension.exists() != value.exists()"/>
            <xpath value="exists(f:extension)!=exists(f:*[starts-with(local-name(.), 'value')])"/>
         </constraint>
         <mapping>
            <identity value="rim"/>
            <map value="n/a"/>
         </mapping>
         <mapping>
            <identity value="rim"/>
            <map value="N/A"/>
         </mapping>
      </element>
      <element id="Observation.category.coding:snomedCT.extension:snomedCTDescriptionID">
         <path value="Observation.category.coding.extension"/>
         <sliceName value="snomedCTDescriptionID"/>
         <short value="The SNOMED CT Description ID for the display"/>
         <definition value="The SNOMED CT Description ID for the display."/>
         <comment value="There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions.  The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone."/>
         <alias value="extensions"/>
         <alias value="user content"/>
         <min value="0"/>
         <max value="1"/>
         <base>
            <path value="Element.extension"/>
            <min value="0"/>
            <max value="*"/>
         </base>
         <type>
            <code value="Extension"/>
            <profile value="https://fhir.hl7.org.uk/STU3/StructureDefinition/Extension-coding-sctdescid"/>
         </type>
         <condition value="ele-1"/>
         <constraint>
            <key value="ele-1"/>
            <severity value="error"/>
            <human value="All FHIR elements must have a @value or children"/>
            <expression value="hasValue() | (children().count() > id.count())"/>
            <xpath value="@value|f:*|h:div"/>
         </constraint>
         <constraint>
            <key value="ext-1"/>
            <severity value="error"/>
            <human value="Must have either extensions or value[x], not both"/>
            <expression value="extension.exists() != value.exists()"/>
            <xpath value="exists(f:extension)!=exists(f:*[starts-with(local-name(.), 'value')])"/>
         </constraint>
         <mapping>
            <identity value="rim"/>
            <map value="n/a"/>
         </mapping>
         <mapping>
            <identity value="rim"/>
            <map value="N/A"/>
         </mapping>
      </element>
      <element id="Observation.category.coding:snomedCT.extension:snomedCTDescriptionID.id">
         <path value="Observation.category.coding.extension.id"/>
         <representation value="xmlAttr"/>
         <short value="xml:id (or equivalent in JSON)"/>
         <definition value="unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces."/>
         <comment value="Note that FHIR strings may not exceed 1MB in size"/>
         <min value="0"/>
         <max value="1"/>
         <base>
            <path value="Element.id"/>
            <min value="0"/>
            <max value="1"/>
         </base>
         <type>
            <code value="string"/>
         </type>
         <condition value="ele-1"/>
         <constraint>
            <key value="ele-1"/>
            <severity value="error"/>
            <human value="All FHIR elements must have a @value or children"/>
            <expression value="hasValue() | (children().count() > id.count())"/>
            <xpath value="@value|f:*|h:div"/>
         </constraint>
         <mapping>
            <identity value="rim"/>
            <map value="n/a"/>
         </mapping>
      </element>
      <element id="Observation.category.coding:snomedCT.extension:snomedCTDescriptionID.extension">
         <path value="Observation.category.coding.extension.extension"/>
         <slicing>
            <discriminator>
               <type value="value"/>
               <path value="url"/>
            </discriminator>
            <description value="Extensions are always sliced by (at least) url"/>
            <rules value="open"/>
         </slicing>
         <short value="Additional Content defined by implementations"/>
         <definition value="May be used to represent additional information that is not part of the basic definition of the element. In order to make the use of extensions safe and manageable, there is a strict set of governance  applied to the definition and use of extensions. Though any implementer is allowed to define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension."/>
         <comment value="There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions.  The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone."/>
         <alias value="extensions"/>
         <alias value="user content"/>
         <min value="0"/>
         <max value="*"/>
         <base>
            <path value="Element.extension"/>
            <min value="0"/>
            <max value="*"/>
         </base>
         <type>
            <code value="Extension"/>
         </type>
         <condition value="ele-1"/>
         <constraint>
            <key value="ele-1"/>
            <severity value="error"/>
            <human value="All FHIR elements must have a @value or children"/>
            <expression value="hasValue() | (children().count() > id.count())"/>
            <xpath value="@value|f:*|h:div"/>
         </constraint>
         <constraint>
            <key value="ext-1"/>
            <severity value="error"/>
            <human value="Must have either extensions or value[x], not both"/>
            <expression value="extension.exists() != value.exists()"/>
            <xpath value="exists(f:extension)!=exists(f:*[starts-with(local-name(.), 'value')])"/>
         </constraint>
         <mapping>
            <identity value="rim"/>
            <map value="n/a"/>
         </mapping>
         <mapping>
            <identity value="rim"/>
            <map value="N/A"/>
         </mapping>
      </element>
      <element id="Observation.category.coding:snomedCT.extension:snomedCTDescriptionID.url">
         <path value="Observation.category.coding.extension.url"/>
         <representation value="xmlAttr"/>
         <short value="identifies the meaning of the extension"/>
         <definition value="Source of the definition for the extension code - a logical name or a URL."/>
         <comment value="The definition may point directly to a computable or human-readable definition of the extensibility codes, or it may be a logical URI as declared in some other specification. The definition SHALL be a URI for the Structure Definition defining the extension."/>
         <min value="1"/>
         <max value="1"/>
         <base>
            <path value="Extension.url"/>
            <min value="1"/>
            <max value="1"/>
         </base>
         <type>
            <code value="uri"/>
         </type>
         <fixedUri value="https://fhir.hl7.org.uk/STU3/StructureDefinition/Extension-coding-sctdescid"/>
         <condition value="ele-1"/>
         <constraint>
            <key value="ele-1"/>
            <severity value="error"/>
            <human value="All FHIR elements must have a @value or children"/>
            <expression value="hasValue() | (children().count() > id.count())"/>
            <xpath value="@value|f:*|h:div"/>
         </constraint>
         <mapping>
            <identity value="rim"/>
            <map value="n/a"/>
         </mapping>
         <mapping>
            <identity value="rim"/>
            <map value="N/A"/>
         </mapping>
      </element>
      <element id="Observation.category.coding:snomedCT.extension:snomedCTDescriptionID.value[x]">
         <path value="Observation.category.coding.extension.value[x]"/>
         <short value="Value of extension"/>
         <definition value="Value of extension - may be a resource or one of a constrained set of the data types (see Extensibility in the spec for list)."/>
         <comment value="A stream of bytes, base64 encoded"/>
         <min value="0"/>
         <max value="1"/>
         <base>
            <path value="Extension.value[x]"/>
            <min value="0"/>
            <max value="1"/>
         </base>
         <type>
            <code value="base64Binary"/>
         </type>
         <type>
            <code value="boolean"/>
         </type>
         <type>
            <code value="code"/>
         </type>
         <type>
            <code value="date"/>
         </type>
         <type>
            <code value="dateTime"/>
         </type>
         <type>
            <code value="decimal"/>
         </type>
         <type>
            <code value="id"/>
         </type>
         <type>
            <code value="instant"/>
         </type>
         <type>
            <code value="integer"/>
         </type>
         <type>
            <code value="markdown"/>
         </type>
         <type>
            <code value="oid"/>
         </type>
         <type>
            <code value="positiveInt"/>
         </type>
         <type>
            <code value="string"/>
         </type>
         <type>
            <code value="time"/>
         </type>
         <type>
            <code value="unsignedInt"/>
         </type>
         <type>
            <code value="uri"/>
         </type>
         <type>
            <code value="Address"/>
         </type>
         <type>
            <code value="Age"/>
         </type>
         <type>
            <code value="Annotation"/>
         </type>
         <type>
            <code value="Attachment"/>
         </type>
         <type>
            <code value="CodeableConcept"/>
         </type>
         <type>
            <code value="Coding"/>
         </type>
         <type>
            <code value="ContactPoint"/>
         </type>
         <type>
            <code value="Count"/>
         </type>
         <type>
            <code value="Distance"/>
         </type>
         <type>
            <code value="Duration"/>
         </type>
         <type>
            <code value="HumanName"/>
         </type>
         <type>
            <code value="Identifier"/>
         </type>
         <type>
            <code value="Money"/>
         </type>
         <type>
            <code value="Period"/>
         </type>
         <type>
            <code value="Quantity"/>
         </type>
         <type>
            <code value="Range"/>
         </type>
         <type>
            <code value="Ratio"/>
         </type>
         <type>
            <code value="Reference"/>
         </type>
         <type>
            <code value="SampledData"/>
         </type>
         <type>
            <code value="Signature"/>
         </type>
         <type>
            <code value="Timing"/>
         </type>
         <type>
            <code value="Meta"/>
         </type>
         <condition value="ele-1"/>
         <constraint>
            <key value="ele-1"/>
            <severity value="error"/>
            <human value="All FHIR elements must have a @value or children"/>
            <expression value="hasValue() | (children().count() > id.count())"/>
            <xpath value="@value|f:*|h:div"/>
         </constraint>
         <mapping>
            <identity value="rim"/>
            <map value="n/a"/>
         </mapping>
         <mapping>
            <identity value="rim"/>
            <map value="N/A"/>
         </mapping>
      </element>
      <element id="Observation.category.coding:snomedCT.system">
         <path value="Observation.category.coding.system"/>
         <short value="Identity of the terminology system"/>
         <definition value="The identification of the code system that defines the meaning of the symbol in the code."/>
         <comment value="The URI may be an OID (urn:oid:...) or a UUID (urn:uuid:...).  OIDs and UUIDs SHALL be references to the HL7 OID registry. Otherwise, the URI should come from HL7's list of FHIR defined special URIs or it should de-reference to some definition that establish the system clearly and unambiguously."/>
         <requirements value="Need to be unambiguous about the source of the definition of the symbol."/>
         <min value="1"/>
         <max value="1"/>
         <base>
            <path value="Coding.system"/>
            <min value="0"/>
            <max value="1"/>
         </base>
         <type>
            <code value="uri"/>
         </type>
         <fixedUri value="http://snomed.info/sct"/>
         <condition value="ele-1"/>
         <constraint>
            <key value="ele-1"/>
            <severity value="error"/>
            <human value="All FHIR elements must have a @value or children"/>
            <expression value="hasValue() | (children().count() > id.count())"/>
            <xpath value="@value|f:*|h:div"/>
         </constraint>
         <isSummary value="true"/>
         <mapping>
            <identity value="rim"/>
            <map value="n/a"/>
         </mapping>
         <mapping>
            <identity value="v2"/>
            <map value="C*E.3"/>
         </mapping>
         <mapping>
            <identity value="rim"/>
            <map value="./codeSystem"/>
         </mapping>
         <mapping>
            <identity value="orim"/>
            <map value="fhir:Coding.system rdfs:subPropertyOf dt:CDCoding.codeSystem"/>
         </mapping>
      </element>
      <element id="Observation.category.coding:snomedCT.version">
         <path value="Observation.category.coding.version"/>
         <short value="Version of the system - if relevant"/>
         <definition value="The version of the code system which was used when choosing this code. Note that a well-maintained code system does not need the version reported, because the meaning of codes is consistent across versions. However this cannot consistently be assured. and when the meaning is not guaranteed to be consistent, the version SHOULD be exchanged."/>
         <comment value="Where the terminology does not clearly define what string should be used to identify code system versions, the recommendation is to use the date (expressed in FHIR date format) on which that version was officially published as the version date."/>
         <min value="0"/>
         <max value="0"/>
         <base>
            <path value="Coding.version"/>
            <min value="0"/>
            <max value="1"/>
         </base>
         <type>
            <code value="string"/>
         </type>
         <condition value="ele-1"/>
         <constraint>
            <key value="ele-1"/>
            <severity value="error"/>
            <human value="All FHIR elements must have a @value or children"/>
            <expression value="hasValue() | (children().count() > id.count())"/>
            <xpath value="@value|f:*|h:div"/>
         </constraint>
         <isSummary value="true"/>
         <mapping>
            <identity value="rim"/>
            <map value="n/a"/>
         </mapping>
         <mapping>
            <identity value="v2"/>
            <map value="C*E.7"/>
         </mapping>
         <mapping>
            <identity value="rim"/>
            <map value="./codeSystemVersion"/>
         </mapping>
         <mapping>
            <identity value="orim"/>
            <map value="fhir:Coding.version rdfs:subPropertyOf dt:CDCoding.codeSystemVersion"/>
         </mapping>
      </element>
      <element id="Observation.category.coding:snomedCT.code">
         <path value="Observation.category.coding.code"/>
         <short value="Symbol in syntax defined by the system"/>
         <definition value="A symbol in syntax defined by the system. The symbol may be a predefined code or an expression in a syntax defined by the coding system (e.g. post-coordination)."/>
         <comment value="Note that FHIR strings may not exceed 1MB in size"/>
         <requirements value="Need to refer to a particular code in the system."/>
         <min value="1"/>
         <max value="1"/>
         <base>
            <path value="Coding.code"/>
            <min value="0"/>
            <max value="1"/>
         </base>
         <type>
            <code value="code"/>
         </type>
         <condition value="ele-1"/>
         <constraint>
            <key value="ele-1"/>
            <severity value="error"/>
            <human value="All FHIR elements must have a @value or children"/>
            <expression value="hasValue() | (children().count() > id.count())"/>
            <xpath value="@value|f:*|h:div"/>
         </constraint>
         <isSummary value="true"/>
         <mapping>
            <identity value="rim"/>
            <map value="n/a"/>
         </mapping>
         <mapping>
            <identity value="v2"/>
            <map value="C*E.1"/>
         </mapping>
         <mapping>
            <identity value="rim"/>
            <map value="./code"/>
         </mapping>
         <mapping>
            <identity value="orim"/>
            <map value="fhir:Coding.code rdfs:subPropertyOf dt:CDCoding.code"/>
         </mapping>
      </element>
      <element id="Observation.category.coding:snomedCT.display">
         <extension url="http://hl7.org/fhir/StructureDefinition/elementdefinition-translatable">
            <valueBoolean value="true"/>
         </extension>
         <path value="Observation.category.coding.display"/>
         <short value="Representation defined by the system"/>
         <definition value="A representation of the meaning of the code in the system, following the rules of the system."/>
         <comment value="Note that FHIR strings may not exceed 1MB in size"/>
         <requirements value="Need to be able to carry a human-readable meaning of the code for readers that do not know  the system."/>
         <min value="1"/>
         <max value="1"/>
         <base>
            <path value="Coding.display"/>
            <min value="0"/>
            <max value="1"/>
         </base>
         <type>
            <code value="string"/>
         </type>
         <condition value="ele-1"/>
         <constraint>
            <key value="ele-1"/>
            <severity value="error"/>
            <human value="All FHIR elements must have a @value or children"/>
            <expression value="hasValue() | (children().count() > id.count())"/>
            <xpath value="@value|f:*|h:div"/>
         </constraint>
         <isSummary value="true"/>
         <mapping>
            <identity value="rim"/>
            <map value="n/a"/>
         </mapping>
         <mapping>
            <identity value="v2"/>
            <map value="C*E.2 - but note this is not well followed"/>
         </mapping>
         <mapping>
            <identity value="rim"/>
            <map value="CV.displayName"/>
         </mapping>
         <mapping>
            <identity value="orim"/>
            <map value="fhir:Coding.display rdfs:subPropertyOf dt:CDCoding.displayName"/>
         </mapping>
      </element>
      <element id="Observation.category.coding:snomedCT.userSelected">
         <path value="Observation.category.coding.userSelected"/>
         <short value="If this coding was chosen directly by the user"/>
         <definition value="Indicates that this coding was chosen by a user directly - i.e. off a pick list of available items (codes or displays)."/>
         <comment value="Amongst a set of alternatives, a directly chosen code is the most appropriate starting point for new translations. There is some ambiguity about what exactly 'directly chosen' implies, and trading partner agreement may be needed to clarify the use of this element and its consequences more completely."/>
         <requirements value="This has been identified as a clinical safety criterium - that this exact system/code pair was chosen explicitly, rather than inferred by the system based on some rules or language processing."/>
         <min value="0"/>
         <max value="1"/>
         <base>
            <path value="Coding.userSelected"/>
            <min value="0"/>
            <max value="1"/>
         </base>
         <type>
            <code value="boolean"/>
         </type>
         <condition value="ele-1"/>
         <constraint>
            <key value="ele-1"/>
            <severity value="error"/>
            <human value="All FHIR elements must have a @value or children"/>
            <expression value="hasValue() | (children().count() > id.count())"/>
            <xpath value="@value|f:*|h:div"/>
         </constraint>
         <isSummary value="true"/>
         <mapping>
            <identity value="rim"/>
            <map value="n/a"/>
         </mapping>
         <mapping>
            <identity value="v2"/>
            <map value="Sometimes implied by being first"/>
         </mapping>
         <mapping>
            <identity value="rim"/>
            <map value="CD.codingRationale"/>
         </mapping>
         <mapping>
            <identity value="orim"/>
            <map value="fhir:Coding.userSelected fhir:mapsTo dt:CDCoding.codingRationale. fhir:Coding.userSelected fhir:hasMap fhir:Coding.userSelected.map. fhir:Coding.userSelected.map a fhir:Map;   fhir:target dt:CDCoding.codingRationale. fhir:Coding.userSelected\#true a [     fhir:source "true";     fhir:target dt:CDCoding.codingRationale\#O   ]"/>
         </mapping>
      </element>
      <element id="Observation.category.text">
         <extension url="http://hl7.org/fhir/StructureDefinition/elementdefinition-translatable">
            <valueBoolean value="true"/>
         </extension>
         <path value="Observation.category.text"/>
         <short value="Plain text representation of the concept"/>
         <definition value="A human language representation of the concept as seen/selected/uttered by the user who entered the data and/or which represents the intended meaning of the user."/>
         <comment value="Very often the text is the same as a displayName of one of the codings."/>
         <requirements value="The codes from the terminologies do not always capture the correct meaning with all the nuances of the human using them, or sometimes there is no appropriate code at all. In these cases, the text is used to capture the full meaning of the source."/>
         <min value="0"/>
         <max value="0"/>
         <base>
            <path value="CodeableConcept.text"/>
            <min value="0"/>
            <max value="1"/>
         </base>
         <type>
            <code value="string"/>
         </type>
         <condition value="ele-1"/>
         <constraint>
            <key value="ele-1"/>
            <severity value="error"/>
            <human value="All FHIR elements must have a @value or children"/>
            <expression value="hasValue() | (children().count() > id.count())"/>
            <xpath value="@value|f:*|h:div"/>
         </constraint>
         <isSummary value="true"/>
         <mapping>
            <identity value="rim"/>
            <map value="n/a"/>
         </mapping>
         <mapping>
            <identity value="v2"/>
            <map value="C*E.9. But note many systems use C*E.2 for this"/>
         </mapping>
         <mapping>
            <identity value="rim"/>
            <map value="./originalText[mediaType/code="text/plain"]/data"/>
         </mapping>
         <mapping>
            <identity value="orim"/>
            <map value="fhir:CodeableConcept.text rdfs:subPropertyOf dt:CD.originalText"/>
         </mapping>
      </element>
      <element id="Observation.code">
         <path value="Observation.code"/>
         <short value="Type of measurement observation (code / type)"/>
         <definition value="Describes what was observed. Sometimes this is called the observation "name"."/>
         <comment value="Not all terminology uses fit this general pattern. In some cases, models should not use CodeableConcept and use Coding directly and provide their own structure for managing text, codings, translations and the relationship between elements and pre- and post-coordination."/>
         <requirements value="Knowing what kind of observation is being made is essential to understanding the observation."/>
         <alias value="Name"/>
         <min value="1"/>
         <max value="1"/>
         <base>
            <path value="Observation.code"/>
            <min value="1"/>
            <max value="1"/>
         </base>
         <type>
            <code value="CodeableConcept"/>
         </type>
         <condition value="ele-1"/>
         <constraint>
            <key value="ele-1"/>
            <severity value="error"/>
            <human value="All FHIR elements must have a @value or children"/>
            <expression value="hasValue() | (children().count() > id.count())"/>
            <xpath value="@value|f:*|h:div"/>
         </constraint>
         <isSummary value="true"/>
         <binding>
            <extension url="http://hl7.org/fhir/StructureDefinition/elementdefinition-bindingName">
               <valueString value="ObservationCode"/>
            </extension>
            <strength value="example"/>
            <description value="Codes identifying names of simple observations."/>
            <valueSetReference>
               <reference value="http://hl7.org/fhir/ValueSet/observation-codes"/>
            </valueSetReference>
         </binding>
         <mapping>
            <identity value="rim"/>
            <map value="n/a"/>
         </mapping>
         <mapping>
            <identity value="v2"/>
            <map value="CE/CNE/CWE"/>
         </mapping>
         <mapping>
            <identity value="rim"/>
            <map value="CD"/>
         </mapping>
         <mapping>
            <identity value="orim"/>
            <map value="fhir:CodeableConcept rdfs:subClassOf dt:CD"/>
         </mapping>
         <mapping>
            <identity value="workflow"/>
            <map value="Event.code"/>
         </mapping>
         <mapping>
            <identity value="sct-concept"/>
            <map value="< 363787002 |Observable entity| OR < 386053000 |Evaluation procedure|"/>
         </mapping>
         <mapping>
            <identity value="v2"/>
            <map value="OBX-3"/>
         </mapping>
         <mapping>
            <identity value="rim"/>
            <map value="code"/>
         </mapping>
         <mapping>
            <identity value="sct-attr"/>
            <map value="116680003 |Is a|"/>
         </mapping>
         <mapping>
            <identity value="w5"/>
            <map value="what"/>
         </mapping>
      </element>
      <element id="Observation.code.id">
         <path value="Observation.code.id"/>
         <representation value="xmlAttr"/>
         <short value="xml:id (or equivalent in JSON)"/>
         <definition value="unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces."/>
         <comment value="Note that FHIR strings may not exceed 1MB in size"/>
         <min value="0"/>
         <max value="1"/>
         <base>
            <path value="Element.id"/>
            <min value="0"/>
            <max value="1"/>
         </base>
         <type>
            <code value="string"/>
         </type>
         <condition value="ele-1"/>
         <constraint>
            <key value="ele-1"/>
            <severity value="error"/>
            <human value="All FHIR elements must have a @value or children"/>
            <expression value="hasValue() | (children().count() > id.count())"/>
            <xpath value="@value|f:*|h:div"/>
         </constraint>
         <mapping>
            <identity value="rim"/>
            <map value="n/a"/>
         </mapping>
      </element>
      <element id="Observation.code.extension">
         <path value="Observation.code.extension"/>
         <slicing>
            <discriminator>
               <type value="value"/>
               <path value="url"/>
            </discriminator>
            <description value="Extensions are always sliced by (at least) url"/>
            <rules value="open"/>
         </slicing>
         <short value="Additional Content defined by implementations"/>
         <definition value="May be used to represent additional information that is not part of the basic definition of the element. In order to make the use of extensions safe and manageable, there is a strict set of governance  applied to the definition and use of extensions. Though any implementer is allowed to define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension."/>
         <comment value="There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions.  The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone."/>
         <alias value="extensions"/>
         <alias value="user content"/>
         <min value="0"/>
         <max value="*"/>
         <base>
            <path value="Element.extension"/>
            <min value="0"/>
            <max value="*"/>
         </base>
         <type>
            <code value="Extension"/>
         </type>
         <condition value="ele-1"/>
         <constraint>
            <key value="ele-1"/>
            <severity value="error"/>
            <human value="All FHIR elements must have a @value or children"/>
            <expression value="hasValue() | (children().count() > id.count())"/>
            <xpath value="@value|f:*|h:div"/>
         </constraint>
         <constraint>
            <key value="ext-1"/>
            <severity value="error"/>
            <human value="Must have either extensions or value[x], not both"/>
            <expression value="extension.exists() != value.exists()"/>
            <xpath value="exists(f:extension)!=exists(f:*[starts-with(local-name(.), 'value')])"/>
         </constraint>
         <mapping>
            <identity value="rim"/>
            <map value="n/a"/>
         </mapping>
         <mapping>
            <identity value="rim"/>
            <map value="N/A"/>
         </mapping>
      </element>
      <element id="Observation.code.coding">
         <path value="Observation.code.coding"/>
         <slicing>
            <discriminator>
               <type value="value"/>
               <path value="system"/>
            </discriminator>
            <ordered value="false"/>
            <rules value="open"/>
         </slicing>
         <short value="Code defined by a terminology system"/>
         <definition value="A reference to a code defined by a terminology system."/>
         <comment value="Codes may be defined very casually in enumerations, or code lists, up to very formal definitions such as SNOMED CT - see the HL7 v3 Core Principles for more information.  Ordering of codings is undefined and SHALL NOT be used to infer meaning. Generally, at most only one of the coding values will be labeled as UserSelected = true."/>
         <requirements value="Allows for translations and alternate encodings within a code system.  Also supports communication of the same instance to systems requiring different encodings."/>
         <min value="2"/>
         <max value="2"/>
         <base>
            <path value="CodeableConcept.coding"/>
            <min value="0"/>
            <max value="*"/>
         </base>
         <type>
            <code value="Coding"/>
         </type>
         <condition value="ele-1"/>
         <constraint>
            <key value="ele-1"/>
            <severity value="error"/>
            <human value="All FHIR elements must have a @value or children"/>
            <expression value="hasValue() | (children().count() > id.count())"/>
            <xpath value="@value|f:*|h:div"/>
         </constraint>
         <isSummary value="true"/>
         <mapping>
            <identity value="rim"/>
            <map value="n/a"/>
         </mapping>
         <mapping>
            <identity value="v2"/>
            <map value="CE/CNE/CWE subset one of the sets of component 1-3 or 4-6"/>
         </mapping>
         <mapping>
            <identity value="rim"/>
            <map value="CV"/>
         </mapping>
         <mapping>
            <identity value="orim"/>
            <map value="fhir:Coding rdfs:subClassOf dt:CDCoding"/>
         </mapping>
         <mapping>
            <identity value="v2"/>
            <map value="C*E.1-8, C*E.10-22"/>
         </mapping>
         <mapping>
            <identity value="rim"/>
            <map value="union(., ./translation)"/>
         </mapping>
         <mapping>
            <identity value="orim"/>
            <map value="fhir:CodeableConcept.coding rdfs:subPropertyOf dt:CD.coding"/>
         </mapping>
      </element>
      <element id="Observation.code.coding:loinc">
         <path value="Observation.code.coding"/>
         <sliceName value="loinc"/>
         <short value="Code defined by a terminology system"/>
         <definition value="A reference to a code defined by a terminology system."/>
         <comment value="Codes may be defined very casually in enumerations, or code lists, up to very formal definitions such as SNOMED CT - see the HL7 v3 Core Principles for more information.  Ordering of codings is undefined and SHALL NOT be used to infer meaning. Generally, at most only one of the coding values will be labeled as UserSelected = true."/>
         <requirements value="Allows for translations and alternate encodings within a code system.  Also supports communication of the same instance to systems requiring different encodings."/>
         <min value="1"/>
         <max value="1"/>
         <base>
            <path value="CodeableConcept.coding"/>
            <min value="0"/>
            <max value="*"/>
         </base>
         <type>
            <code value="Coding"/>
         </type>
         <condition value="ele-1"/>
         <constraint>
            <key value="ele-1"/>
            <severity value="error"/>
            <human value="All FHIR elements must have a @value or children"/>
            <expression value="hasValue() | (children().count() > id.count())"/>
            <xpath value="@value|f:*|h:div"/>
         </constraint>
         <isSummary value="true"/>
         <mapping>
            <identity value="rim"/>
            <map value="n/a"/>
         </mapping>
         <mapping>
            <identity value="v2"/>
            <map value="CE/CNE/CWE subset one of the sets of component 1-3 or 4-6"/>
         </mapping>
         <mapping>
            <identity value="rim"/>
            <map value="CV"/>
         </mapping>
         <mapping>
            <identity value="orim"/>
            <map value="fhir:Coding rdfs:subClassOf dt:CDCoding"/>
         </mapping>
         <mapping>
            <identity value="v2"/>
            <map value="C*E.1-8, C*E.10-22"/>
         </mapping>
         <mapping>
            <identity value="rim"/>
            <map value="union(., ./translation)"/>
         </mapping>
         <mapping>
            <identity value="orim"/>
            <map value="fhir:CodeableConcept.coding rdfs:subPropertyOf dt:CD.coding"/>
         </mapping>
      </element>
      <element id="Observation.code.coding:loinc.id">
         <path value="Observation.code.coding.id"/>
         <representation value="xmlAttr"/>
         <short value="xml:id (or equivalent in JSON)"/>
         <definition value="unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces."/>
         <comment value="Note that FHIR strings may not exceed 1MB in size"/>
         <min value="0"/>
         <max value="1"/>
         <base>
            <path value="Element.id"/>
            <min value="0"/>
            <max value="1"/>
         </base>
         <type>
            <code value="string"/>
         </type>
         <condition value="ele-1"/>
         <constraint>
            <key value="ele-1"/>
            <severity value="error"/>
            <human value="All FHIR elements must have a @value or children"/>
            <expression value="hasValue() | (children().count() > id.count())"/>
            <xpath value="@value|f:*|h:div"/>
         </constraint>
         <mapping>
            <identity value="rim"/>
            <map value="n/a"/>
         </mapping>
      </element>
      <element id="Observation.code.coding:loinc.extension">
         <path value="Observation.code.coding.extension"/>
         <slicing>
            <discriminator>
               <type value="value"/>
               <path value="url"/>
            </discriminator>
            <description value="Extensions are always sliced by (at least) url"/>
            <rules value="open"/>
         </slicing>
         <short value="Additional Content defined by implementations"/>
         <definition value="May be used to represent additional information that is not part of the basic definition of the element. In order to make the use of extensions safe and manageable, there is a strict set of governance  applied to the definition and use of extensions. Though any implementer is allowed to define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension."/>
         <comment value="There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions.  The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone."/>
         <alias value="extensions"/>
         <alias value="user content"/>
         <min value="0"/>
         <max value="*"/>
         <base>
            <path value="Element.extension"/>
            <min value="0"/>
            <max value="*"/>
         </base>
         <type>
            <code value="Extension"/>
         </type>
         <condition value="ele-1"/>
         <constraint>
            <key value="ele-1"/>
            <severity value="error"/>
            <human value="All FHIR elements must have a @value or children"/>
            <expression value="hasValue() | (children().count() > id.count())"/>
            <xpath value="@value|f:*|h:div"/>
         </constraint>
         <constraint>
            <key value="ext-1"/>
            <severity value="error"/>
            <human value="Must have either extensions or value[x], not both"/>
            <expression value="extension.exists() != value.exists()"/>
            <xpath value="exists(f:extension)!=exists(f:*[starts-with(local-name(.), 'value')])"/>
         </constraint>
         <mapping>
            <identity value="rim"/>
            <map value="n/a"/>
         </mapping>
         <mapping>
            <identity value="rim"/>
            <map value="N/A"/>
         </mapping>
      </element>
      <element id="Observation.code.coding:loinc.system">
         <path value="Observation.code.coding.system"/>
         <short value="Identity of the terminology system"/>
         <definition value="The identification of the code system that defines the meaning of the symbol in the code."/>
         <comment value="The URI may be an OID (urn:oid:...) or a UUID (urn:uuid:...).  OIDs and UUIDs SHALL be references to the HL7 OID registry. Otherwise, the URI should come from HL7's list of FHIR defined special URIs or it should de-reference to some definition that establish the system clearly and unambiguously."/>
         <requirements value="Need to be unambiguous about the source of the definition of the symbol."/>
         <min value="1"/>
         <max value="1"/>
         <base>
            <path value="Coding.system"/>
            <min value="0"/>
            <max value="1"/>
         </base>
         <type>
            <code value="uri"/>
         </type>
         <fixedUri value="http://loinc.org"/>
         <condition value="ele-1"/>
         <constraint>
            <key value="ele-1"/>
            <severity value="error"/>
            <human value="All FHIR elements must have a @value or children"/>
            <expression value="hasValue() | (children().count() > id.count())"/>
            <xpath value="@value|f:*|h:div"/>
         </constraint>
         <isSummary value="true"/>
         <mapping>
            <identity value="rim"/>
            <map value="n/a"/>
         </mapping>
         <mapping>
            <identity value="v2"/>
            <map value="C*E.3"/>
         </mapping>
         <mapping>
            <identity value="rim"/>
            <map value="./codeSystem"/>
         </mapping>
         <mapping>
            <identity value="orim"/>
            <map value="fhir:Coding.system rdfs:subPropertyOf dt:CDCoding.codeSystem"/>
         </mapping>
      </element>
      <element id="Observation.code.coding:loinc.version">
         <path value="Observation.code.coding.version"/>
         <short value="Version of the system - if relevant"/>
         <definition value="The version of the code system which was used when choosing this code. Note that a well-maintained code system does not need the version reported, because the meaning of codes is consistent across versions. However this cannot consistently be assured. and when the meaning is not guaranteed to be consistent, the version SHOULD be exchanged."/>
         <comment value="Where the terminology does not clearly define what string should be used to identify code system versions, the recommendation is to use the date (expressed in FHIR date format) on which that version was officially published as the version date."/>
         <min value="0"/>
         <max value="0"/>
         <base>
            <path value="Coding.version"/>
            <min value="0"/>
            <max value="1"/>
         </base>
         <type>
            <code value="string"/>
         </type>
         <condition value="ele-1"/>
         <constraint>
            <key value="ele-1"/>
            <severity value="error"/>
            <human value="All FHIR elements must have a @value or children"/>
            <expression value="hasValue() | (children().count() > id.count())"/>
            <xpath value="@value|f:*|h:div"/>
         </constraint>
         <isSummary value="true"/>
         <mapping>
            <identity value="rim"/>
            <map value="n/a"/>
         </mapping>
         <mapping>
            <identity value="v2"/>
            <map value="C*E.7"/>
         </mapping>
         <mapping>
            <identity value="rim"/>
            <map value="./codeSystemVersion"/>
         </mapping>
         <mapping>
            <identity value="orim"/>
            <map value="fhir:Coding.version rdfs:subPropertyOf dt:CDCoding.codeSystemVersion"/>
         </mapping>
      </element>
      <element id="Observation.code.coding:loinc.code">
         <path value="Observation.code.coding.code"/>
         <short value="Symbol in syntax defined by the system"/>
         <definition value="A symbol in syntax defined by the system. The symbol may be a predefined code or an expression in a syntax defined by the coding system (e.g. post-coordination)."/>
         <comment value="Note that FHIR strings may not exceed 1MB in size"/>
         <requirements value="Need to refer to a particular code in the system."/>
         <min value="1"/>
         <max value="1"/>
         <base>
            <path value="Coding.code"/>
            <min value="0"/>
            <max value="1"/>
         </base>
         <type>
            <code value="code"/>
         </type>
         <fixedCode value="29463-7"/>
         <condition value="ele-1"/>
         <constraint>
            <key value="ele-1"/>
            <severity value="error"/>
            <human value="All FHIR elements must have a @value or children"/>
            <expression value="hasValue() | (children().count() > id.count())"/>
            <xpath value="@value|f:*|h:div"/>
         </constraint>
         <isSummary value="true"/>
         <mapping>
            <identity value="rim"/>
            <map value="n/a"/>
         </mapping>
         <mapping>
            <identity value="v2"/>
            <map value="C*E.1"/>
         </mapping>
         <mapping>
            <identity value="rim"/>
            <map value="./code"/>
         </mapping>
         <mapping>
            <identity value="orim"/>
            <map value="fhir:Coding.code rdfs:subPropertyOf dt:CDCoding.code"/>
         </mapping>
      </element>
      <element id="Observation.code.coding:loinc.display">
         <extension url="http://hl7.org/fhir/StructureDefinition/elementdefinition-translatable">
            <valueBoolean value="true"/>
         </extension>
         <path value="Observation.code.coding.display"/>
         <short value="Representation defined by the system"/>
         <definition value="A representation of the meaning of the code in the system, following the rules of the system."/>
         <comment value="Note that FHIR strings may not exceed 1MB in size"/>
         <requirements value="Need to be able to carry a human-readable meaning of the code for readers that do not know  the system."/>
         <min value="0"/>
         <max value="0"/>
         <base>
            <path value="Coding.display"/>
            <min value="0"/>
            <max value="1"/>
         </base>
         <type>
            <code value="string"/>
         </type>
         <condition value="ele-1"/>
         <constraint>
            <key value="ele-1"/>
            <severity value="error"/>
            <human value="All FHIR elements must have a @value or children"/>
            <expression value="hasValue() | (children().count() > id.count())"/>
            <xpath value="@value|f:*|h:div"/>
         </constraint>
         <isSummary value="true"/>
         <mapping>
            <identity value="rim"/>
            <map value="n/a"/>
         </mapping>
         <mapping>
            <identity value="v2"/>
            <map value="C*E.2 - but note this is not well followed"/>
         </mapping>
         <mapping>
            <identity value="rim"/>
            <map value="CV.displayName"/>
         </mapping>
         <mapping>
            <identity value="orim"/>
            <map value="fhir:Coding.display rdfs:subPropertyOf dt:CDCoding.displayName"/>
         </mapping>
      </element>
      <element id="Observation.code.coding:loinc.userSelected">
         <path value="Observation.code.coding.userSelected"/>
         <short value="If this coding was chosen directly by the user"/>
         <definition value="Indicates that this coding was chosen by a user directly - i.e. off a pick list of available items (codes or displays)."/>
         <comment value="Amongst a set of alternatives, a directly chosen code is the most appropriate starting point for new translations. There is some ambiguity about what exactly 'directly chosen' implies, and trading partner agreement may be needed to clarify the use of this element and its consequences more completely."/>
         <requirements value="This has been identified as a clinical safety criterium - that this exact system/code pair was chosen explicitly, rather than inferred by the system based on some rules or language processing."/>
         <min value="0"/>
         <max value="0"/>
         <base>
            <path value="Coding.userSelected"/>
            <min value="0"/>
            <max value="1"/>
         </base>
         <type>
            <code value="boolean"/>
         </type>
         <condition value="ele-1"/>
         <constraint>
            <key value="ele-1"/>
            <severity value="error"/>
            <human value="All FHIR elements must have a @value or children"/>
            <expression value="hasValue() | (children().count() > id.count())"/>
            <xpath value="@value|f:*|h:div"/>
         </constraint>
         <isSummary value="true"/>
         <mapping>
            <identity value="rim"/>
            <map value="n/a"/>
         </mapping>
         <mapping>
            <identity value="v2"/>
            <map value="Sometimes implied by being first"/>
         </mapping>
         <mapping>
            <identity value="rim"/>
            <map value="CD.codingRationale"/>
         </mapping>
         <mapping>
            <identity value="orim"/>
            <map value="fhir:Coding.userSelected fhir:mapsTo dt:CDCoding.codingRationale. fhir:Coding.userSelected fhir:hasMap fhir:Coding.userSelected.map. fhir:Coding.userSelected.map a fhir:Map;   fhir:target dt:CDCoding.codingRationale. fhir:Coding.userSelected\#true a [     fhir:source "true";     fhir:target dt:CDCoding.codingRationale\#O   ]"/>
         </mapping>
      </element>
      <element id="Observation.code.coding:snomedCT">
         <path value="Observation.code.coding"/>
         <sliceName value="snomedCT"/>
         <short value="Code defined by a terminology system"/>
         <definition value="A reference to a code defined by a terminology system."/>
         <comment value="Codes may be defined very casually in enumerations, or code lists, up to very formal definitions such as SNOMED CT - see the HL7 v3 Core Principles for more information.  Ordering of codings is undefined and SHALL NOT be used to infer meaning. Generally, at most only one of the coding values will be labeled as UserSelected = true."/>
         <requirements value="Allows for translations and alternate encodings within a code system.  Also supports communication of the same instance to systems requiring different encodings."/>
         <min value="1"/>
         <max value="1"/>
         <base>
            <path value="CodeableConcept.coding"/>
            <min value="0"/>
            <max value="*"/>
         </base>
         <type>
            <code value="Coding"/>
         </type>
         <condition value="ele-1"/>
         <constraint>
            <key value="ele-1"/>
            <severity value="error"/>
            <human value="All FHIR elements must have a @value or children"/>
            <expression value="hasValue() | (children().count() > id.count())"/>
            <xpath value="@value|f:*|h:div"/>
         </constraint>
         <isSummary value="true"/>
         <binding>
            <strength value="required"/>
            <description value="Codes identifying weight observation"/>
            <valueSetReference>
               <reference value="https://fhir.nhs.uk/STU3/ValueSet/DCH-Weight-1"/>
            </valueSetReference>
         </binding>
         <mapping>
            <identity value="rim"/>
            <map value="n/a"/>
         </mapping>
         <mapping>
            <identity value="v2"/>
            <map value="CE/CNE/CWE subset one of the sets of component 1-3 or 4-6"/>
         </mapping>
         <mapping>
            <identity value="rim"/>
            <map value="CV"/>
         </mapping>
         <mapping>
            <identity value="orim"/>
            <map value="fhir:Coding rdfs:subClassOf dt:CDCoding"/>
         </mapping>
         <mapping>
            <identity value="v2"/>
            <map value="C*E.1-8, C*E.10-22"/>
         </mapping>
         <mapping>
            <identity value="rim"/>
            <map value="union(., ./translation)"/>
         </mapping>
         <mapping>
            <identity value="orim"/>
            <map value="fhir:CodeableConcept.coding rdfs:subPropertyOf dt:CD.coding"/>
         </mapping>
      </element>
      <element id="Observation.code.coding:snomedCT.id">
         <path value="Observation.code.coding.id"/>
         <representation value="xmlAttr"/>
         <short value="xml:id (or equivalent in JSON)"/>
         <definition value="unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces."/>
         <comment value="Note that FHIR strings may not exceed 1MB in size"/>
         <min value="0"/>
         <max value="1"/>
         <base>
            <path value="Element.id"/>
            <min value="0"/>
            <max value="1"/>
         </base>
         <type>
            <code value="string"/>
         </type>
         <condition value="ele-1"/>
         <constraint>
            <key value="ele-1"/>
            <severity value="error"/>
            <human value="All FHIR elements must have a @value or children"/>
            <expression value="hasValue() | (children().count() > id.count())"/>
            <xpath value="@value|f:*|h:div"/>
         </constraint>
         <mapping>
            <identity value="rim"/>
            <map value="n/a"/>
         </mapping>
      </element>
      <element id="Observation.code.coding:snomedCT.extension">
         <path value="Observation.code.coding.extension"/>
         <slicing>
            <discriminator>
               <type value="value"/>
               <path value="url"/>
            </discriminator>
            <description value="Extensions are always sliced by (at least) url"/>
            <rules value="open"/>
         </slicing>
         <short value="Additional Content defined by implementations"/>
         <definition value="May be used to represent additional information that is not part of the basic definition of the element. In order to make the use of extensions safe and manageable, there is a strict set of governance  applied to the definition and use of extensions. Though any implementer is allowed to define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension."/>
         <comment value="There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions.  The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone."/>
         <alias value="extensions"/>
         <alias value="user content"/>
         <min value="0"/>
         <max value="*"/>
         <base>
            <path value="Element.extension"/>
            <min value="0"/>
            <max value="*"/>
         </base>
         <type>
            <code value="Extension"/>
         </type>
         <condition value="ele-1"/>
         <constraint>
            <key value="ele-1"/>
            <severity value="error"/>
            <human value="All FHIR elements must have a @value or children"/>
            <expression value="hasValue() | (children().count() > id.count())"/>
            <xpath value="@value|f:*|h:div"/>
         </constraint>
         <constraint>
            <key value="ext-1"/>
            <severity value="error"/>
            <human value="Must have either extensions or value[x], not both"/>
            <expression value="extension.exists() != value.exists()"/>
            <xpath value="exists(f:extension)!=exists(f:*[starts-with(local-name(.), 'value')])"/>
         </constraint>
         <mapping>
            <identity value="rim"/>
            <map value="n/a"/>
         </mapping>
         <mapping>
            <identity value="rim"/>
            <map value="N/A"/>
         </mapping>
      </element>
      <element id="Observation.code.coding:snomedCT.extension:snomedCTDescriptionID">
         <path value="Observation.code.coding.extension"/>
         <sliceName value="snomedCTDescriptionID"/>
         <short value="Additional Content defined by implementations"/>
         <definition value="May be used to represent additional information that is not part of the basic definition of the element. In order to make the use of extensions safe and manageable, there is a strict set of governance  applied to the definition and use of extensions. Though any implementer is allowed to define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension."/>
         <comment value="There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions.  The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone."/>
         <alias value="extensions"/>
         <alias value="user content"/>
         <min value="0"/>
         <max value="*"/>
         <base>
            <path value="Element.extension"/>
            <min value="0"/>
            <max value="*"/>
         </base>
         <type>
            <code value="Extension"/>
            <profile value="https://fhir.hl7.org.uk/STU3/StructureDefinition/Extension-coding-sctdescid"/>
         </type>
         <condition value="ele-1"/>
         <constraint>
            <key value="ele-1"/>
            <severity value="error"/>
            <human value="All FHIR elements must have a @value or children"/>
            <expression value="hasValue() | (children().count() > id.count())"/>
            <xpath value="@value|f:*|h:div"/>
         </constraint>
         <constraint>
            <key value="ext-1"/>
            <severity value="error"/>
            <human value="Must have either extensions or value[x], not both"/>
            <expression value="extension.exists() != value.exists()"/>
            <xpath value="exists(f:extension)!=exists(f:*[starts-with(local-name(.), 'value')])"/>
         </constraint>
         <mapping>
            <identity value="rim"/>
            <map value="n/a"/>
         </mapping>
         <mapping>
            <identity value="rim"/>
            <map value="N/A"/>
         </mapping>
      </element>
      <element id="Observation.code.coding:snomedCT.system">
         <path value="Observation.code.coding.system"/>
         <short value="Identity of the terminology system"/>
         <definition value="The identification of the code system that defines the meaning of the symbol in the code."/>
         <comment value="The URI may be an OID (urn:oid:...) or a UUID (urn:uuid:...).  OIDs and UUIDs SHALL be references to the HL7 OID registry. Otherwise, the URI should come from HL7's list of FHIR defined special URIs or it should de-reference to some definition that establish the system clearly and unambiguously."/>
         <requirements value="Need to be unambiguous about the source of the definition of the symbol."/>
         <min value="1"/>
         <max value="1"/>
         <base>
            <path value="Coding.system"/>
            <min value="0"/>
            <max value="1"/>
         </base>
         <type>
            <code value="uri"/>
         </type>
         <fixedUri value="http://snomed.info/sct"/>
         <condition value="ele-1"/>
         <constraint>
            <key value="ele-1"/>
            <severity value="error"/>
            <human value="All FHIR elements must have a @value or children"/>
            <expression value="hasValue() | (children().count() > id.count())"/>
            <xpath value="@value|f:*|h:div"/>
         </constraint>
         <isSummary value="true"/>
         <mapping>
            <identity value="rim"/>
            <map value="n/a"/>
         </mapping>
         <mapping>
            <identity value="v2"/>
            <map value="C*E.3"/>
         </mapping>
         <mapping>
            <identity value="rim"/>
            <map value="./codeSystem"/>
         </mapping>
         <mapping>
            <identity value="orim"/>
            <map value="fhir:Coding.system rdfs:subPropertyOf dt:CDCoding.codeSystem"/>
         </mapping>
      </element>
      <element id="Observation.code.coding:snomedCT.version">
         <path value="Observation.code.coding.version"/>
         <short value="Version of the system - if relevant"/>
         <definition value="The version of the code system which was used when choosing this code. Note that a well-maintained code system does not need the version reported, because the meaning of codes is consistent across versions. However this cannot consistently be assured. and when the meaning is not guaranteed to be consistent, the version SHOULD be exchanged."/>
         <comment value="Where the terminology does not clearly define what string should be used to identify code system versions, the recommendation is to use the date (expressed in FHIR date format) on which that version was officially published as the version date."/>
         <min value="0"/>
         <max value="0"/>
         <base>
            <path value="Coding.version"/>
            <min value="0"/>
            <max value="1"/>
         </base>
         <type>
            <code value="string"/>
         </type>
         <condition value="ele-1"/>
         <constraint>
            <key value="ele-1"/>
            <severity value="error"/>
            <human value="All FHIR elements must have a @value or children"/>
            <expression value="hasValue() | (children().count() > id.count())"/>
            <xpath value="@value|f:*|h:div"/>
         </constraint>
         <isSummary value="true"/>
         <mapping>
            <identity value="rim"/>
            <map value="n/a"/>
         </mapping>
         <mapping>
            <identity value="v2"/>
            <map value="C*E.7"/>
         </mapping>
         <mapping>
            <identity value="rim"/>
            <map value="./codeSystemVersion"/>
         </mapping>
         <mapping>
            <identity value="orim"/>
            <map value="fhir:Coding.version rdfs:subPropertyOf dt:CDCoding.codeSystemVersion"/>
         </mapping>
      </element>
      <element id="Observation.code.coding:snomedCT.code">
         <path value="Observation.code.coding.code"/>
         <short value="Symbol in syntax defined by the system"/>
         <definition value="A symbol in syntax defined by the system. The symbol may be a predefined code or an expression in a syntax defined by the coding system (e.g. post-coordination)."/>
         <comment value="Note that FHIR strings may not exceed 1MB in size"/>
         <requirements value="Need to refer to a particular code in the system."/>
         <min value="1"/>
         <max value="1"/>
         <base>
            <path value="Coding.code"/>
            <min value="0"/>
            <max value="1"/>
         </base>
         <type>
            <code value="code"/>
         </type>
         <condition value="ele-1"/>
         <constraint>
            <key value="ele-1"/>
            <severity value="error"/>
            <human value="All FHIR elements must have a @value or children"/>
            <expression value="hasValue() | (children().count() > id.count())"/>
            <xpath value="@value|f:*|h:div"/>
         </constraint>
         <isSummary value="true"/>
         <mapping>
            <identity value="rim"/>
            <map value="n/a"/>
         </mapping>
         <mapping>
            <identity value="v2"/>
            <map value="C*E.1"/>
         </mapping>
         <mapping>
            <identity value="rim"/>
            <map value="./code"/>
         </mapping>
         <mapping>
            <identity value="orim"/>
            <map value="fhir:Coding.code rdfs:subPropertyOf dt:CDCoding.code"/>
         </mapping>
      </element>
      <element id="Observation.code.coding:snomedCT.display">
         <extension url="http://hl7.org/fhir/StructureDefinition/elementdefinition-translatable">
            <valueBoolean value="true"/>
         </extension>
         <path value="Observation.code.coding.display"/>
         <short value="Representation defined by the system"/>
         <definition value="A representation of the meaning of the code in the system, following the rules of the system."/>
         <comment value="Note that FHIR strings may not exceed 1MB in size"/>
         <requirements value="Need to be able to carry a human-readable meaning of the code for readers that do not know  the system."/>
         <min value="1"/>
         <max value="1"/>
         <base>
            <path value="Coding.display"/>
            <min value="0"/>
            <max value="1"/>
         </base>
         <type>
            <code value="string"/>
         </type>
         <condition value="ele-1"/>
         <constraint>
            <key value="ele-1"/>
            <severity value="error"/>
            <human value="All FHIR elements must have a @value or children"/>
            <expression value="hasValue() | (children().count() > id.count())"/>
            <xpath value="@value|f:*|h:div"/>
         </constraint>
         <isSummary value="true"/>
         <mapping>
            <identity value="rim"/>
            <map value="n/a"/>
         </mapping>
         <mapping>
            <identity value="v2"/>
            <map value="C*E.2 - but note this is not well followed"/>
         </mapping>
         <mapping>
            <identity value="rim"/>
            <map value="CV.displayName"/>
         </mapping>
         <mapping>
            <identity value="orim"/>
            <map value="fhir:Coding.display rdfs:subPropertyOf dt:CDCoding.displayName"/>
         </mapping>
      </element>
      <element id="Observation.code.coding:snomedCT.userSelected">
         <path value="Observation.code.coding.userSelected"/>
         <short value="If this coding was chosen directly by the user"/>
         <definition value="Indicates that this coding was chosen by a user directly - i.e. off a pick list of available items (codes or displays)."/>
         <comment value="Amongst a set of alternatives, a directly chosen code is the most appropriate starting point for new translations. There is some ambiguity about what exactly 'directly chosen' implies, and trading partner agreement may be needed to clarify the use of this element and its consequences more completely."/>
         <requirements value="This has been identified as a clinical safety criterium - that this exact system/code pair was chosen explicitly, rather than inferred by the system based on some rules or language processing."/>
         <min value="0"/>
         <max value="0"/>
         <base>
            <path value="Coding.userSelected"/>
            <min value="0"/>
            <max value="1"/>
         </base>
         <type>
            <code value="boolean"/>
         </type>
         <condition value="ele-1"/>
         <constraint>
            <key value="ele-1"/>
            <severity value="error"/>
            <human value="All FHIR elements must have a @value or children"/>
            <expression value="hasValue() | (children().count() > id.count())"/>
            <xpath value="@value|f:*|h:div"/>
         </constraint>
         <isSummary value="true"/>
         <mapping>
            <identity value="rim"/>
            <map value="n/a"/>
         </mapping>
         <mapping>
            <identity value="v2"/>
            <map value="Sometimes implied by being first"/>
         </mapping>
         <mapping>
            <identity value="rim"/>
            <map value="CD.codingRationale"/>
         </mapping>
         <mapping>
            <identity value="orim"/>
            <map value="fhir:Coding.userSelected fhir:mapsTo dt:CDCoding.codingRationale. fhir:Coding.userSelected fhir:hasMap fhir:Coding.userSelected.map. fhir:Coding.userSelected.map a fhir:Map;   fhir:target dt:CDCoding.codingRationale. fhir:Coding.userSelected\#true a [     fhir:source "true";     fhir:target dt:CDCoding.codingRationale\#O   ]"/>
         </mapping>
      </element>
      <element id="Observation.code.text">
         <extension url="http://hl7.org/fhir/StructureDefinition/elementdefinition-translatable">
            <valueBoolean value="true"/>
         </extension>
         <path value="Observation.code.text"/>
         <short value="Plain text representation of the concept"/>
         <definition value="A human language representation of the concept as seen/selected/uttered by the user who entered the data and/or which represents the intended meaning of the user."/>
         <comment value="Very often the text is the same as a displayName of one of the codings."/>
         <requirements value="The codes from the terminologies do not always capture the correct meaning with all the nuances of the human using them, or sometimes there is no appropriate code at all. In these cases, the text is used to capture the full meaning of the source."/>
         <min value="0"/>
         <max value="0"/>
         <base>
            <path value="CodeableConcept.text"/>
            <min value="0"/>
            <max value="1"/>
         </base>
         <type>
            <code value="string"/>
         </type>
         <condition value="ele-1"/>
         <constraint>
            <key value="ele-1"/>
            <severity value="error"/>
            <human value="All FHIR elements must have a @value or children"/>
            <expression value="hasValue() | (children().count() > id.count())"/>
            <xpath value="@value|f:*|h:div"/>
         </constraint>
         <isSummary value="true"/>
         <mapping>
            <identity value="rim"/>
            <map value="n/a"/>
         </mapping>
         <mapping>
            <identity value="v2"/>
            <map value="C*E.9. But note many systems use C*E.2 for this"/>
         </mapping>
         <mapping>
            <identity value="rim"/>
            <map value="./originalText[mediaType/code="text/plain"]/data"/>
         </mapping>
         <mapping>
            <identity value="orim"/>
            <map value="fhir:CodeableConcept.text rdfs:subPropertyOf dt:CD.originalText"/>
         </mapping>
      </element>
      <element id="Observation.subject">
         <path value="Observation.subject"/>
         <short value="The subject of the measurement observation"/>
         <definition value="The patient, or group of patients, location, or device whose characteristics (direct or indirect) are described by the observation and into whose record the observation is placed.  Comments: Indirect characteristics may be those of a specimen, fetus, donor,  other observer (for example a relative or EMT), or any observation made about the subject."/>
         <comment value="One would expect this element to be a cardinality  of 1..1.  The only circumstance in which the subject can be missing is when the observation is made by a device that does not know the patient. In this case, the observation SHALL be matched to a patient through some context/channel matching technique, and at this point, the observation should be updated.  If the target of the observation is different than the subject, the general extension [observation-focal-subject](extension-observation-focal-subject.html).  may be used.  However, the distinction between the patient's own value for an observation versus that of the fetus, or the donor or blood product unit, etc., are often specified in the observation code."/>
         <requirements value="Observations have no value if you don't know who or what they're about."/>
         <min value="1"/>
         <max value="1"/>
         <base>
            <path value="Observation.subject"/>
            <min value="0"/>
            <max value="1"/>
         </base>
         <type>
            <code value="Reference"/>
            <targetProfile value="https://fhir.nhs.uk/STU3/StructureDefinition/CareConnect-DCH-Patient-1"/>
         </type>
         <condition value="ele-1"/>
         <constraint>
            <key value="ele-1"/>
            <severity value="error"/>
            <human value="All FHIR elements must have a @value or children"/>
            <expression value="hasValue() | (children().count() > id.count())"/>
            <xpath value="@value|f:*|h:div"/>
         </constraint>
         <constraint>
            <key value="ref-1"/>
            <severity value="error"/>
            <human value="SHALL have a contained resource if a local reference is provided"/>
            <expression value="reference.startsWith('#').not() or (reference.substring(1).trace('url') in %resource.contained.id.trace('ids'))"/>
            <xpath value="not(starts-with(f:reference/@value, '#')) or exists(ancestor::*[self::f:entry or self::f:parameter]/f:resource/f:*/f:contained/f:*[f:id/@value=substring-after(current()/f:reference/@value, '#')]|/*/f:contained/f:*[f:id/@value=substring-after(current()/f:reference/@value, '#')])"/>
         </constraint>
         <isSummary value="true"/>
         <mapping>
            <identity value="rim"/>
            <map value="n/a"/>
         </mapping>
         <mapping>
            <identity value="rim"/>
            <map value="The target of a resource reference is a RIM entry point (Act, Role, or Entity)"/>
         </mapping>
         <mapping>
            <identity value="workflow"/>
            <map value="Event.subject"/>
         </mapping>
         <mapping>
            <identity value="v2"/>
            <map value="PID-3"/>
         </mapping>
         <mapping>
            <identity value="rim"/>
            <map value="participation[typeCode=SBJ]"/>
         </mapping>
         <mapping>
            <identity value="w5"/>
            <map value="who.focus"/>
         </mapping>
      </element>
      <element id="Observation.subject.id">
         <path value="Observation.subject.id"/>
         <representation value="xmlAttr"/>
         <short value="xml:id (or equivalent in JSON)"/>
         <definition value="unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces."/>
         <comment value="Note that FHIR strings may not exceed 1MB in size"/>
         <min value="0"/>
         <max value="1"/>
         <base>
            <path value="Element.id"/>
            <min value="0"/>
            <max value="1"/>
         </base>
         <type>
            <code value="string"/>
         </type>
         <condition value="ele-1"/>
         <constraint>
            <key value="ele-1"/>
            <severity value="error"/>
            <human value="All FHIR elements must have a @value or children"/>
            <expression value="hasValue() | (children().count() > id.count())"/>
            <xpath value="@value|f:*|h:div"/>
         </constraint>
         <mapping>
            <identity value="rim"/>
            <map value="n/a"/>
         </mapping>
      </element>
      <element id="Observation.subject.extension">
         <path value="Observation.subject.extension"/>
         <slicing>
            <discriminator>
               <type value="value"/>
               <path value="url"/>
            </discriminator>
            <description value="Extensions are always sliced by (at least) url"/>
            <rules value="open"/>
         </slicing>
         <short value="Additional Content defined by implementations"/>
         <definition value="May be used to represent additional information that is not part of the basic definition of the element. In order to make the use of extensions safe and manageable, there is a strict set of governance  applied to the definition and use of extensions. Though any implementer is allowed to define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension."/>
         <comment value="There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions.  The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone."/>
         <alias value="extensions"/>
         <alias value="user content"/>
         <min value="0"/>
         <max value="*"/>
         <base>
            <path value="Element.extension"/>
            <min value="0"/>
            <max value="*"/>
         </base>
         <type>
            <code value="Extension"/>
         </type>
         <condition value="ele-1"/>
         <constraint>
            <key value="ele-1"/>
            <severity value="error"/>
            <human value="All FHIR elements must have a @value or children"/>
            <expression value="hasValue() | (children().count() > id.count())"/>
            <xpath value="@value|f:*|h:div"/>
         </constraint>
         <constraint>
            <key value="ext-1"/>
            <severity value="error"/>
            <human value="Must have either extensions or value[x], not both"/>
            <expression value="extension.exists() != value.exists()"/>
            <xpath value="exists(f:extension)!=exists(f:*[starts-with(local-name(.), 'value')])"/>
         </constraint>
         <mapping>
            <identity value="rim"/>
            <map value="n/a"/>
         </mapping>
         <mapping>
            <identity value="rim"/>
            <map value="N/A"/>
         </mapping>
      </element>
      <element id="Observation.subject.reference">
         <path value="Observation.subject.reference"/>
         <short value="Literal reference, Relative, internal or absolute URL"/>
         <definition value="A reference to a location at which the other resource is found. The reference may be a relative reference, in which case it is relative to the service base URL, or an absolute URL that resolves to the location where the resource is found. The reference may be version specific or not. If the reference is not to a FHIR RESTful server, then it should be assumed to be version specific. Internal fragment references (start with '#') refer to contained resources."/>
         <comment value="Using absolute URLs provides a stable scalable approach suitable for a cloud/web context, while using relative/logical references provides a flexible approach suitable for use when trading across closed eco-system boundaries.   Absolute URLs do not need to point to a FHIR RESTful server, though this is the preferred approach. If the URL conforms to the structure "/[type]/[id]" then it should be assumed that the reference is to a FHIR RESTful server."/>
         <min value="1"/>
         <max value="1"/>
         <base>
            <path value="Reference.reference"/>
            <min value="0"/>
            <max value="1"/>
         </base>
         <type>
            <code value="string"/>
         </type>
         <condition value="ele-1"/>
         <condition value="ref-1"/>
         <constraint>
            <key value="ele-1"/>
            <severity value="error"/>
            <human value="All FHIR elements must have a @value or children"/>
            <expression value="hasValue() | (children().count() > id.count())"/>
            <xpath value="@value|f:*|h:div"/>
         </constraint>
         <isSummary value="true"/>
         <mapping>
            <identity value="rim"/>
            <map value="n/a"/>
         </mapping>
         <mapping>
            <identity value="rim"/>
            <map value="N/A"/>
         </mapping>
      </element>
      <element id="Observation.subject.identifier">
         <path value="Observation.subject.identifier"/>
         <short value="Logical reference, when literal reference is not known"/>
         <definition value="An identifier for the other resource. This is used when there is no way to reference the other resource directly, either because the entity is not available through a FHIR server, or because there is no way for the author of the resource to convert a known identifier to an actual location. There is no requirement that a Reference.identifier point to something that is actually exposed as a FHIR instance, but it SHALL point to a business concept that would be expected to be exposed as a FHIR instance, and that instance would need to be of a FHIR resource type allowed by the reference."/>
         <comment value="When an identifier is provided in place of a reference, any system processing the reference will only be able to resolve the identifier to a reference if it understands the business context in which the identifier is used. Sometimes this is global (e.g. a national identifier) but often it is not. For this reason, none of the useful mechanisms described for working with references (e.g. chaining, includes) are possible, nor should servers be expected to be able resolve the reference. Servers may accept an identifier based reference untouched, resolve it, and/or reject it - see CapabilityStatement.rest.resource.referencePolicy.   When both an identifier and a literal reference are provided, the literal reference is preferred. Applications processing the resource are allowed - but not required - to check that the identifier matches the literal reference  Applications converting a logical reference to a literal reference may choose to leave the logical reference present, or remove it."/>
         <min value="0"/>
         <max value="1"/>
         <base>
            <path value="Reference.identifier"/>
            <min value="0"/>
            <max value="1"/>
         </base>
         <type>
            <code value="Identifier"/>
         </type>
         <condition value="ele-1"/>
         <constraint>
            <key value="ele-1"/>
            <severity value="error"/>
            <human value="All FHIR elements must have a @value or children"/>
            <expression value="hasValue() | (children().count() > id.count())"/>
            <xpath value="@value|f:*|h:div"/>
         </constraint>
         <isSummary value="true"/>
         <mapping>
            <identity value="rim"/>
            <map value="n/a"/>
         </mapping>
         <mapping>
            <identity value="v2"/>
            <map value="CX / EI (occasionally, more often EI maps to a resource id or a URL)"/>
         </mapping>
         <mapping>
            <identity value="rim"/>
            <map value="II - see see identifier pattern at http://wiki.hl7.org/index.php?title=Common_Design_Patterns#Identifier_Pattern for relevant discussion. The Identifier class is a little looser than the v3 type II because it allows URIs as well as registered OIDs or GUIDs.  Also maps to Role[classCode=IDENT]"/>
         </mapping>
         <mapping>
            <identity value="servd"/>
            <map value="Identifier"/>
         </mapping>
         <mapping>
            <identity value="rim"/>
            <map value=".identifier"/>
         </mapping>
      </element>
      <element id="Observation.subject.display">
         <extension url="http://hl7.org/fhir/StructureDefinition/elementdefinition-translatable">
            <valueBoolean value="true"/>
         </extension>
         <path value="Observation.subject.display"/>
         <short value="Text alternative for the resource"/>
         <definition value="Plain text narrative that identifies the resource in addition to the resource reference."/>
         <comment value="This is generally not the same as the Resource.text of the referenced resource.  The purpose is to identify what's being referenced, not to fully describe it."/>
         <min value="0"/>
         <max value="1"/>
         <base>
            <path value="Reference.display"/>
            <min value="0"/>
            <max value="1"/>
         </base>
         <type>
            <code value="string"/>
         </type>
         <condition value="ele-1"/>
         <constraint>
            <key value="ele-1"/>
            <severity value="error"/>
            <human value="All FHIR elements must have a @value or children"/>
            <expression value="hasValue() | (children().count() > id.count())"/>
            <xpath value="@value|f:*|h:div"/>
         </constraint>
         <isSummary value="true"/>
         <mapping>
            <identity value="rim"/>
            <map value="n/a"/>
         </mapping>
         <mapping>
            <identity value="rim"/>
            <map value="N/A"/>
         </mapping>
      </element>
      <element id="Observation.context">
         <path value="Observation.context"/>
         <short value="Child health encounter during which this observation is made"/>
         <definition value="The healthcare event  (e.g. a patient and healthcare provider interaction) during which this observation is made."/>
         <comment value="This will typically be the encounter the event occurred within, but some events may be initiated prior to or after the official completion of an encounter or episode but still be tied to the context of the encounter or episode (e.g. pre-admission lab tests)."/>
         <requirements value="For some observations it may be important to know the link between an observation and a particular encounter."/>
         <alias value="Encounter"/>
         <min value="1"/>
         <max value="1"/>
         <base>
            <path value="Observation.context"/>
            <min value="0"/>
            <max value="1"/>
         </base>
         <type>
            <code value="Reference"/>
            <targetProfile value="https://fhir.nhs.uk/STU3/StructureDefinition/CareConnect-DCH-Encounter-1"/>
         </type>
         <condition value="ele-1"/>
         <constraint>
            <key value="ele-1"/>
            <severity value="error"/>
            <human value="All FHIR elements must have a @value or children"/>
            <expression value="hasValue() | (children().count() > id.count())"/>
            <xpath value="@value|f:*|h:div"/>
         </constraint>
         <constraint>
            <key value="ref-1"/>
            <severity value="error"/>
            <human value="SHALL have a contained resource if a local reference is provided"/>
            <expression value="reference.startsWith('#').not() or (reference.substring(1).trace('url') in %resource.contained.id.trace('ids'))"/>
            <xpath value="not(starts-with(f:reference/@value, '#')) or exists(ancestor::*[self::f:entry or self::f:parameter]/f:resource/f:*/f:contained/f:*[f:id/@value=substring-after(current()/f:reference/@value, '#')]|/*/f:contained/f:*[f:id/@value=substring-after(current()/f:reference/@value, '#')])"/>
         </constraint>
         <mapping>
            <identity value="rim"/>
            <map value="n/a"/>
         </mapping>
         <mapping>
            <identity value="rim"/>
            <map value="The target of a resource reference is a RIM entry point (Act, Role, or Entity)"/>
         </mapping>
         <mapping>
            <identity value="workflow"/>
            <map value="Event.context"/>
         </mapping>
         <mapping>
            <identity value="v2"/>
            <map value="PV1"/>
         </mapping>
         <mapping>
            <identity value="rim"/>
            <map value="inboundRelationship[typeCode=COMP].source[classCode=ENC, moodCode=EVN]"/>
         </mapping>
         <mapping>
            <identity value="w5"/>
            <map value="context"/>
         </mapping>
      </element>
      <element id="Observation.context.id">
         <path value="Observation.context.id"/>
         <representation value="xmlAttr"/>
         <short value="xml:id (or equivalent in JSON)"/>
         <definition value="unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces."/>
         <comment value="Note that FHIR strings may not exceed 1MB in size"/>
         <min value="0"/>
         <max value="1"/>
         <base>
            <path value="Element.id"/>
            <min value="0"/>
            <max value="1"/>
         </base>
         <type>
            <code value="string"/>
         </type>
         <condition value="ele-1"/>
         <constraint>
            <key value="ele-1"/>
            <severity value="error"/>
            <human value="All FHIR elements must have a @value or children"/>
            <expression value="hasValue() | (children().count() > id.count())"/>
            <xpath value="@value|f:*|h:div"/>
         </constraint>
         <mapping>
            <identity value="rim"/>
            <map value="n/a"/>
         </mapping>
      </element>
      <element id="Observation.context.extension">
         <path value="Observation.context.extension"/>
         <slicing>
            <discriminator>
               <type value="value"/>
               <path value="url"/>
            </discriminator>
            <description value="Extensions are always sliced by (at least) url"/>
            <rules value="open"/>
         </slicing>
         <short value="Additional Content defined by implementations"/>
         <definition value="May be used to represent additional information that is not part of the basic definition of the element. In order to make the use of extensions safe and manageable, there is a strict set of governance  applied to the definition and use of extensions. Though any implementer is allowed to define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension."/>
         <comment value="There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions.  The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone."/>
         <alias value="extensions"/>
         <alias value="user content"/>
         <min value="0"/>
         <max value="*"/>
         <base>
            <path value="Element.extension"/>
            <min value="0"/>
            <max value="*"/>
         </base>
         <type>
            <code value="Extension"/>
         </type>
         <condition value="ele-1"/>
         <constraint>
            <key value="ele-1"/>
            <severity value="error"/>
            <human value="All FHIR elements must have a @value or children"/>
            <expression value="hasValue() | (children().count() > id.count())"/>
            <xpath value="@value|f:*|h:div"/>
         </constraint>
         <constraint>
            <key value="ext-1"/>
            <severity value="error"/>
            <human value="Must have either extensions or value[x], not both"/>
            <expression value="extension.exists() != value.exists()"/>
            <xpath value="exists(f:extension)!=exists(f:*[starts-with(local-name(.), 'value')])"/>
         </constraint>
         <mapping>
            <identity value="rim"/>
            <map value="n/a"/>
         </mapping>
         <mapping>
            <identity value="rim"/>
            <map value="N/A"/>
         </mapping>
      </element>
      <element id="Observation.context.reference">
         <path value="Observation.context.reference"/>
         <short value="Literal reference, Relative, internal or absolute URL"/>
         <definition value="A reference to a location at which the other resource is found. The reference may be a relative reference, in which case it is relative to the service base URL, or an absolute URL that resolves to the location where the resource is found. The reference may be version specific or not. If the reference is not to a FHIR RESTful server, then it should be assumed to be version specific. Internal fragment references (start with '#') refer to contained resources."/>
         <comment value="Using absolute URLs provides a stable scalable approach suitable for a cloud/web context, while using relative/logical references provides a flexible approach suitable for use when trading across closed eco-system boundaries.   Absolute URLs do not need to point to a FHIR RESTful server, though this is the preferred approach. If the URL conforms to the structure "/[type]/[id]" then it should be assumed that the reference is to a FHIR RESTful server."/>
         <min value="1"/>
         <max value="1"/>
         <base>
            <path value="Reference.reference"/>
            <min value="0"/>
            <max value="1"/>
         </base>
         <type>
            <code value="string"/>
         </type>
         <condition value="ele-1"/>
         <condition value="ref-1"/>
         <constraint>
            <key value="ele-1"/>
            <severity value="error"/>
            <human value="All FHIR elements must have a @value or children"/>
            <expression value="hasValue() | (children().count() > id.count())"/>
            <xpath value="@value|f:*|h:div"/>
         </constraint>
         <isSummary value="true"/>
         <mapping>
            <identity value="rim"/>
            <map value="n/a"/>
         </mapping>
         <mapping>
            <identity value="rim"/>
            <map value="N/A"/>
         </mapping>
      </element>
      <element id="Observation.context.identifier">
         <path value="Observation.context.identifier"/>
         <short value="Logical reference, when literal reference is not known"/>
         <definition value="An identifier for the other resource. This is used when there is no way to reference the other resource directly, either because the entity is not available through a FHIR server, or because there is no way for the author of the resource to convert a known identifier to an actual location. There is no requirement that a Reference.identifier point to something that is actually exposed as a FHIR instance, but it SHALL point to a business concept that would be expected to be exposed as a FHIR instance, and that instance would need to be of a FHIR resource type allowed by the reference."/>
         <comment value="When an identifier is provided in place of a reference, any system processing the reference will only be able to resolve the identifier to a reference if it understands the business context in which the identifier is used. Sometimes this is global (e.g. a national identifier) but often it is not. For this reason, none of the useful mechanisms described for working with references (e.g. chaining, includes) are possible, nor should servers be expected to be able resolve the reference. Servers may accept an identifier based reference untouched, resolve it, and/or reject it - see CapabilityStatement.rest.resource.referencePolicy.   When both an identifier and a literal reference are provided, the literal reference is preferred. Applications processing the resource are allowed - but not required - to check that the identifier matches the literal reference  Applications converting a logical reference to a literal reference may choose to leave the logical reference present, or remove it."/>
         <min value="0"/>
         <max value="1"/>
         <base>
            <path value="Reference.identifier"/>
            <min value="0"/>
            <max value="1"/>
         </base>
         <type>
            <code value="Identifier"/>
         </type>
         <condition value="ele-1"/>
         <constraint>
            <key value="ele-1"/>
            <severity value="error"/>
            <human value="All FHIR elements must have a @value or children"/>
            <expression value="hasValue() | (children().count() > id.count())"/>
            <xpath value="@value|f:*|h:div"/>
         </constraint>
         <isSummary value="true"/>
         <mapping>
            <identity value="rim"/>
            <map value="n/a"/>
         </mapping>
         <mapping>
            <identity value="v2"/>
            <map value="CX / EI (occasionally, more often EI maps to a resource id or a URL)"/>
         </mapping>
         <mapping>
            <identity value="rim"/>
            <map value="II - see see identifier pattern at http://wiki.hl7.org/index.php?title=Common_Design_Patterns#Identifier_Pattern for relevant discussion. The Identifier class is a little looser than the v3 type II because it allows URIs as well as registered OIDs or GUIDs.  Also maps to Role[classCode=IDENT]"/>
         </mapping>
         <mapping>
            <identity value="servd"/>
            <map value="Identifier"/>
         </mapping>
         <mapping>
            <identity value="rim"/>
            <map value=".identifier"/>
         </mapping>
      </element>
      <element id="Observation.context.display">
         <extension url="http://hl7.org/fhir/StructureDefinition/elementdefinition-translatable">
            <valueBoolean value="true"/>
         </extension>
         <path value="Observation.context.display"/>
         <short value="Text alternative for the resource"/>
         <definition value="Plain text narrative that identifies the resource in addition to the resource reference."/>
         <comment value="This is generally not the same as the Resource.text of the referenced resource.  The purpose is to identify what's being referenced, not to fully describe it."/>
         <min value="0"/>
         <max value="1"/>
         <base>
            <path value="Reference.display"/>
            <min value="0"/>
            <max value="1"/>
         </base>
         <type>
            <code value="string"/>
         </type>
         <condition value="ele-1"/>
         <constraint>
            <key value="ele-1"/>
            <severity value="error"/>
            <human value="All FHIR elements must have a @value or children"/>
            <expression value="hasValue() | (children().count() > id.count())"/>
            <xpath value="@value|f:*|h:div"/>
         </constraint>
         <isSummary value="true"/>
         <mapping>
            <identity value="rim"/>
            <map value="n/a"/>
         </mapping>
         <mapping>
            <identity value="rim"/>
            <map value="N/A"/>
         </mapping>
      </element>
      <element id="Observation.effective[x]">
         <path value="Observation.effective[x]"/>
         <short value="Clinically relevant time/time-period for observation"/>
         <definition value="The time or time-period the observed value is asserted as being true. For biological subjects - e.g. human patients - this is usually called the "physiologically relevant time". This is usually either the time of the procedure or of specimen collection, but very often the source of the date/time is not known, only the date/time itself."/>
         <comment value="At least a date should be present unless this observation is a historical report."/>
         <requirements value="Knowing when an observation was deemed true is important to its relevance as well as determining trends."/>
         <alias value="Occurrence"/>
         <min value="1"/>
         <max value="1"/>
         <base>
            <path value="Observation.effective[x]"/>
            <min value="0"/>
            <max value="1"/>
         </base>
         <type>
            <code value="dateTime"/>
         </type>
         <type>
            <code value="Period"/>
         </type>
         <condition value="ele-1"/>
         <constraint>
            <key value="ele-1"/>
            <severity value="error"/>
            <human value="All FHIR elements must have a @value or children"/>
            <expression value="hasValue() | (children().count() > id.count())"/>
            <xpath value="@value|f:*|h:div"/>
         </constraint>
         <isSummary value="true"/>
         <mapping>
            <identity value="rim"/>
            <map value="n/a"/>
         </mapping>
         <mapping>
            <identity value="workflow"/>
            <map value="Event.occurrence[x]"/>
         </mapping>
         <mapping>
            <identity value="v2"/>
            <map value="OBX-14, and/or OBX-19 after v2.4  (depends on who observation made)"/>
         </mapping>
         <mapping>
            <identity value="rim"/>
            <map value="effectiveTime"/>
         </mapping>
         <mapping>
            <identity value="w5"/>
            <map value="when.done"/>
         </mapping>
      </element>
      <element id="Observation.issued">
         <path value="Observation.issued"/>
         <short value="Date/Time this was made available"/>
         <definition value="The date and time this observation was made available to providers, typically after the results have been reviewed and verified."/>
         <comment value="Updated when the result is updated."/>
         <min value="0"/>
         <max value="0"/>
         <base>
            <path value="Observation.issued"/>
            <min value="0"/>
            <max value="1"/>
         </base>
         <type>
            <code value="instant"/>
         </type>
         <condition value="ele-1"/>
         <constraint>
            <key value="ele-1"/>
            <severity value="error"/>
            <human value="All FHIR elements must have a @value or children"/>
            <expression value="hasValue() | (children().count() > id.count())"/>
            <xpath value="@value|f:*|h:div"/>
         </constraint>
         <isSummary value="true"/>
         <mapping>
            <identity value="rim"/>
            <map value="n/a"/>
         </mapping>
         <mapping>
            <identity value="v2"/>
            <map value="OBR.22 (or MSH.7), or perhaps OBX-19 (depends on who observation made)"/>
         </mapping>
         <mapping>
            <identity value="rim"/>
            <map value="participation[typeCode=AUT].time"/>
         </mapping>
         <mapping>
            <identity value="w5"/>
            <map value="when.recorded"/>
         </mapping>
      </element>
      <element id="Observation.performer">
         <path value="Observation.performer"/>
         <short value="Professional performing the observation"/>
         <definition value="Who was responsible for asserting the observed value as "true"."/>
         <comment value="References SHALL be a reference to an actual FHIR resource, and SHALL be resolveable (allowing for access control, temporary unavailability, etc). Resolution can be either by retrieval from the URL, or, where applicable by resource type, by treating an absolute reference as a canonical URL and looking it up in a local registry/repository."/>
         <requirements value="May give a degree of confidence in the observation and also indicates where follow-up questions should be directed."/>
         <min value="1"/>
         <max value="1"/>
         <base>
            <path value="Observation.performer"/>
            <min value="0"/>
            <max value="*"/>
         </base>
         <type>
            <code value="Reference"/>
            <targetProfile value="https://fhir.nhs.uk/STU3/StructureDefinition/CareConnect-DCH-Practitioner-1"/>
         </type>
         <condition value="ele-1"/>
         <constraint>
            <key value="ele-1"/>
            <severity value="error"/>
            <human value="All FHIR elements must have a @value or children"/>
            <expression value="hasValue() | (children().count() > id.count())"/>
            <xpath value="@value|f:*|h:div"/>
         </constraint>
         <constraint>
            <key value="ref-1"/>
            <severity value="error"/>
            <human value="SHALL have a contained resource if a local reference is provided"/>
            <expression value="reference.startsWith('#').not() or (reference.substring(1).trace('url') in %resource.contained.id.trace('ids'))"/>
            <xpath value="not(starts-with(f:reference/@value, '#')) or exists(ancestor::*[self::f:entry or self::f:parameter]/f:resource/f:*/f:contained/f:*[f:id/@value=substring-after(current()/f:reference/@value, '#')]|/*/f:contained/f:*[f:id/@value=substring-after(current()/f:reference/@value, '#')])"/>
         </constraint>
         <isSummary value="true"/>
         <mapping>
            <identity value="rim"/>
            <map value="n/a"/>
         </mapping>
         <mapping>
            <identity value="rim"/>
            <map value="The target of a resource reference is a RIM entry point (Act, Role, or Entity)"/>
         </mapping>
         <mapping>
            <identity value="workflow"/>
            <map value="Event.performer"/>
         </mapping>
         <mapping>
            <identity value="v2"/>
            <map value="OBX.15 / (Practitioner)  OBX-16,  PRT-5:PRT-4='RO' /  (Device)  OBX-18 , PRT-10:PRT-4='EQUIP' / (Organization)  OBX-23,  PRT-8:PRT-4='PO'"/>
         </mapping>
         <mapping>
            <identity value="rim"/>
            <map value="participation[typeCode=PRF]"/>
         </mapping>
         <mapping>
            <identity value="w5"/>
            <map value="who.actor"/>
         </mapping>
      </element>
      <element id="Observation.performer.id">
         <path value="Observation.performer.id"/>
         <representation value="xmlAttr"/>
         <short value="xml:id (or equivalent in JSON)"/>
         <definition value="unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces."/>
         <comment value="Note that FHIR strings may not exceed 1MB in size"/>
         <min value="0"/>
         <max value="1"/>
         <base>
            <path value="Element.id"/>
            <min value="0"/>
            <max value="1"/>
         </base>
         <type>
            <code value="string"/>
         </type>
         <condition value="ele-1"/>
         <constraint>
            <key value="ele-1"/>
            <severity value="error"/>
            <human value="All FHIR elements must have a @value or children"/>
            <expression value="hasValue() | (children().count() > id.count())"/>
            <xpath value="@value|f:*|h:div"/>
         </constraint>
         <mapping>
            <identity value="rim"/>
            <map value="n/a"/>
         </mapping>
      </element>
      <element id="Observation.performer.extension">
         <path value="Observation.performer.extension"/>
         <slicing>
            <discriminator>
               <type value="value"/>
               <path value="url"/>
            </discriminator>
            <description value="Extensions are always sliced by (at least) url"/>
            <rules value="open"/>
         </slicing>
         <short value="Additional Content defined by implementations"/>
         <definition value="May be used to represent additional information that is not part of the basic definition of the element. In order to make the use of extensions safe and manageable, there is a strict set of governance  applied to the definition and use of extensions. Though any implementer is allowed to define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension."/>
         <comment value="There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions.  The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone."/>
         <alias value="extensions"/>
         <alias value="user content"/>
         <min value="0"/>
         <max value="*"/>
         <base>
            <path value="Element.extension"/>
            <min value="0"/>
            <max value="*"/>
         </base>
         <type>
            <code value="Extension"/>
         </type>
         <condition value="ele-1"/>
         <constraint>
            <key value="ele-1"/>
            <severity value="error"/>
            <human value="All FHIR elements must have a @value or children"/>
            <expression value="hasValue() | (children().count() > id.count())"/>
            <xpath value="@value|f:*|h:div"/>
         </constraint>
         <constraint>
            <key value="ext-1"/>
            <severity value="error"/>
            <human value="Must have either extensions or value[x], not both"/>
            <expression value="extension.exists() != value.exists()"/>
            <xpath value="exists(f:extension)!=exists(f:*[starts-with(local-name(.), 'value')])"/>
         </constraint>
         <mapping>
            <identity value="rim"/>
            <map value="n/a"/>
         </mapping>
         <mapping>
            <identity value="rim"/>
            <map value="N/A"/>
         </mapping>
      </element>
      <element id="Observation.performer.reference">
         <path value="Observation.performer.reference"/>
         <short value="Literal reference, Relative, internal or absolute URL"/>
         <definition value="A reference to a location at which the other resource is found. The reference may be a relative reference, in which case it is relative to the service base URL, or an absolute URL that resolves to the location where the resource is found. The reference may be version specific or not. If the reference is not to a FHIR RESTful server, then it should be assumed to be version specific. Internal fragment references (start with '#') refer to contained resources."/>
         <comment value="Using absolute URLs provides a stable scalable approach suitable for a cloud/web context, while using relative/logical references provides a flexible approach suitable for use when trading across closed eco-system boundaries.   Absolute URLs do not need to point to a FHIR RESTful server, though this is the preferred approach. If the URL conforms to the structure "/[type]/[id]" then it should be assumed that the reference is to a FHIR RESTful server."/>
         <min value="1"/>
         <max value="1"/>
         <base>
            <path value="Reference.reference"/>
            <min value="0"/>
            <max value="1"/>
         </base>
         <type>
            <code value="string"/>
         </type>
         <condition value="ele-1"/>
         <condition value="ref-1"/>
         <constraint>
            <key value="ele-1"/>
            <severity value="error"/>
            <human value="All FHIR elements must have a @value or children"/>
            <expression value="hasValue() | (children().count() > id.count())"/>
            <xpath value="@value|f:*|h:div"/>
         </constraint>
         <isSummary value="true"/>
         <mapping>
            <identity value="rim"/>
            <map value="n/a"/>
         </mapping>
         <mapping>
            <identity value="rim"/>
            <map value="N/A"/>
         </mapping>
      </element>
      <element id="Observation.performer.identifier">
         <path value="Observation.performer.identifier"/>
         <short value="Logical reference, when literal reference is not known"/>
         <definition value="An identifier for the other resource. This is used when there is no way to reference the other resource directly, either because the entity is not available through a FHIR server, or because there is no way for the author of the resource to convert a known identifier to an actual location. There is no requirement that a Reference.identifier point to something that is actually exposed as a FHIR instance, but it SHALL point to a business concept that would be expected to be exposed as a FHIR instance, and that instance would need to be of a FHIR resource type allowed by the reference."/>
         <comment value="When an identifier is provided in place of a reference, any system processing the reference will only be able to resolve the identifier to a reference if it understands the business context in which the identifier is used. Sometimes this is global (e.g. a national identifier) but often it is not. For this reason, none of the useful mechanisms described for working with references (e.g. chaining, includes) are possible, nor should servers be expected to be able resolve the reference. Servers may accept an identifier based reference untouched, resolve it, and/or reject it - see CapabilityStatement.rest.resource.referencePolicy.   When both an identifier and a literal reference are provided, the literal reference is preferred. Applications processing the resource are allowed - but not required - to check that the identifier matches the literal reference  Applications converting a logical reference to a literal reference may choose to leave the logical reference present, or remove it."/>
         <min value="0"/>
         <max value="1"/>
         <base>
            <path value="Reference.identifier"/>
            <min value="0"/>
            <max value="1"/>
         </base>
         <type>
            <code value="Identifier"/>
         </type>
         <condition value="ele-1"/>
         <constraint>
            <key value="ele-1"/>
            <severity value="error"/>
            <human value="All FHIR elements must have a @value or children"/>
            <expression value="hasValue() | (children().count() > id.count())"/>
            <xpath value="@value|f:*|h:div"/>
         </constraint>
         <isSummary value="true"/>
         <mapping>
            <identity value="rim"/>
            <map value="n/a"/>
         </mapping>
         <mapping>
            <identity value="v2"/>
            <map value="CX / EI (occasionally, more often EI maps to a resource id or a URL)"/>
         </mapping>
         <mapping>
            <identity value="rim"/>
            <map value="II - see see identifier pattern at http://wiki.hl7.org/index.php?title=Common_Design_Patterns#Identifier_Pattern for relevant discussion. The Identifier class is a little looser than the v3 type II because it allows URIs as well as registered OIDs or GUIDs.  Also maps to Role[classCode=IDENT]"/>
         </mapping>
         <mapping>
            <identity value="servd"/>
            <map value="Identifier"/>
         </mapping>
         <mapping>
            <identity value="rim"/>
            <map value=".identifier"/>
         </mapping>
      </element>
      <element id="Observation.performer.display">
         <extension url="http://hl7.org/fhir/StructureDefinition/elementdefinition-translatable">
            <valueBoolean value="true"/>
         </extension>
         <path value="Observation.performer.display"/>
         <short value="Text alternative for the resource"/>
         <definition value="Plain text narrative that identifies the resource in addition to the resource reference."/>
         <comment value="This is generally not the same as the Resource.text of the referenced resource.  The purpose is to identify what's being referenced, not to fully describe it."/>
         <min value="0"/>
         <max value="1"/>
         <base>
            <path value="Reference.display"/>
            <min value="0"/>
            <max value="1"/>
         </base>
         <type>
            <code value="string"/>
         </type>
         <condition value="ele-1"/>
         <constraint>
            <key value="ele-1"/>
            <severity value="error"/>
            <human value="All FHIR elements must have a @value or children"/>
            <expression value="hasValue() | (children().count() > id.count())"/>
            <xpath value="@value|f:*|h:div"/>
         </constraint>
         <isSummary value="true"/>
         <mapping>
            <identity value="rim"/>
            <map value="n/a"/>
         </mapping>
         <mapping>
            <identity value="rim"/>
            <map value="N/A"/>
         </mapping>
      </element>
      <element id="Observation.valueQuantity:valueQuantity">
         <path value="Observation.valueQuantity"/>
         <sliceName value="valueQuantity"/>
         <short value="Measurement observation value"/>
         <definition value="The information determined as a result of making the observation, if the information has a simple value."/>
         <comment value="Normally, an observation will have either a single value or a set of related observations. A few observations (e.g. Apgar score) may have both a value and related observations (for an Apgar score, the observations from which the measure is derived). If a value is present, the datatype for this element should be determined by Observation.code. This element has a variable name depending on the type as follows: valueQuantity, valueCodeableConcept, valueString, valueBoolean, valueRange, valueRatio, valueSampledData, valueAttachment, valueTime, valueDateTime, or valuePeriod. (The name format is "'value' + the type name" with a capital on the first letter of the type).   If the data element is usually coded or if the type associated with the Observation.value defines a coded value, use CodeableConcept instead of string datatype even if the value is uncoded text.  A value set is bound to the ValueCodeableConcept element.    For further discussion and examples see the  [notes section](observation.html#notes) below."/>
         <requirements value="An observation exists to have a value, though it may not if it is in error, or if it represents a group of observations."/>
         <min value="1"/>
         <max value="1"/>
         <base>
            <path value="Observation.value[x]"/>
            <min value="0"/>
            <max value="1"/>
         </base>
         <type>
            <code value="Quantity"/>
         </type>
         <condition value="ele-1"/>
         <condition value="obs-7"/>
         <constraint>
            <key value="ele-1"/>
            <severity value="error"/>
            <human value="All FHIR elements must have a @value or children"/>
            <expression value="hasValue() | (children().count() > id.count())"/>
            <xpath value="@value|f:*|h:div"/>
         </constraint>
         <constraint>
            <key value="qty-3"/>
            <severity value="error"/>
            <human value="If a code for the unit is present, the system SHALL also be present"/>
            <expression value="code.empty() or system.exists()"/>
            <xpath value="not(exists(f:code)) or exists(f:system)"/>
         </constraint>
         <isSummary value="true"/>
         <mapping>
            <identity value="rim"/>
            <map value="n/a"/>
         </mapping>
         <mapping>
            <identity value="v2"/>
            <map value="SN (see also Range) or CQ"/>
         </mapping>
         <mapping>
            <identity value="rim"/>
            <map value="PQ, IVL<PQ>, MO, CO, depending on the values"/>
         </mapping>
         <mapping>
            <identity value="workflow"/>
            <map value="Event.notDone, Event.notDoneReason  (maps to valeu[x] or dataAbsentReason)"/>
         </mapping>
         <mapping>
            <identity value="sct-concept"/>
            <map value="< 441742003 |Evaluation finding|"/>
         </mapping>
         <mapping>
            <identity value="v2"/>
            <map value="OBX.2, OBX.5, OBX.6"/>
         </mapping>
         <mapping>
            <identity value="rim"/>
            <map value="value"/>
         </mapping>
         <mapping>
            <identity value="sct-attr"/>
            <map value="363714003 |Interprets|"/>
         </mapping>
      </element>
      <element id="Observation.value[x]:valueQuantity.id">
         <path value="Observation.valueQuantity.id"/>
         <representation value="xmlAttr"/>
         <short value="xml:id (or equivalent in JSON)"/>
         <definition value="unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces."/>
         <comment value="Note that FHIR strings may not exceed 1MB in size"/>
         <min value="0"/>
         <max value="1"/>
         <base>
            <path value="Element.id"/>
            <min value="0"/>
            <max value="1"/>
         </base>
         <type>
            <code value="string"/>
         </type>
         <condition value="ele-1"/>
         <constraint>
            <key value="ele-1"/>
            <severity value="error"/>
            <human value="All FHIR elements must have a @value or children"/>
            <expression value="hasValue() | (children().count() > id.count())"/>
            <xpath value="@value|f:*|h:div"/>
         </constraint>
         <mapping>
            <identity value="rim"/>
            <map value="n/a"/>
         </mapping>
      </element>
      <element id="Observation.value[x]:valueQuantity.extension">
         <path value="Observation.valueQuantity.extension"/>
         <slicing>
            <discriminator>
               <type value="value"/>
               <path value="url"/>
            </discriminator>
            <description value="Extensions are always sliced by (at least) url"/>
            <rules value="open"/>
         </slicing>
         <short value="Additional Content defined by implementations"/>
         <definition value="May be used to represent additional information that is not part of the basic definition of the element. In order to make the use of extensions safe and manageable, there is a strict set of governance  applied to the definition and use of extensions. Though any implementer is allowed to define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension."/>
         <comment value="There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions.  The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone."/>
         <alias value="extensions"/>
         <alias value="user content"/>
         <min value="0"/>
         <max value="*"/>
         <base>
            <path value="Element.extension"/>
            <min value="0"/>
            <max value="*"/>
         </base>
         <type>
            <code value="Extension"/>
         </type>
         <condition value="ele-1"/>
         <constraint>
            <key value="ele-1"/>
            <severity value="error"/>
            <human value="All FHIR elements must have a @value or children"/>
            <expression value="hasValue() | (children().count() > id.count())"/>
            <xpath value="@value|f:*|h:div"/>
         </constraint>
         <constraint>
            <key value="ext-1"/>
            <severity value="error"/>
            <human value="Must have either extensions or value[x], not both"/>
            <expression value="extension.exists() != value.exists()"/>
            <xpath value="exists(f:extension)!=exists(f:*[starts-with(local-name(.), 'value')])"/>
         </constraint>
         <mapping>
            <identity value="rim"/>
            <map value="n/a"/>
         </mapping>
         <mapping>
            <identity value="rim"/>
            <map value="N/A"/>
         </mapping>
      </element>
      <element id="Observation.valueQuantity:valueQuantity.value">
         <path value="Observation.valueQuantity.value"/>
         <short value="Numerical value (to 3 decimal places)"/>
         <definition value="The value of the measured amount. The value includes an implicit precision in the presentation of the value."/>
         <comment value="The implicit precision in the value should always be honored. Monetary values have their own rules for handling precision (refer to standard accounting text books)."/>
         <requirements value="Precision is handled implicitly in almost all cases of measurement."/>
         <min value="1"/>
         <max value="1"/>
         <base>
            <path value="Quantity.value"/>
            <min value="0"/>
            <max value="1"/>
         </base>
         <type>
            <code value="decimal"/>
         </type>
         <condition value="ele-1"/>
         <constraint>
            <key value="ele-1"/>
            <severity value="error"/>
            <human value="All FHIR elements must have a @value or children"/>
            <expression value="hasValue() | (children().count() > id.count())"/>
            <xpath value="@value|f:*|h:div"/>
         </constraint>
         <isSummary value="true"/>
         <mapping>
            <identity value="rim"/>
            <map value="n/a"/>
         </mapping>
         <mapping>
            <identity value="v2"/>
            <map value="SN.2  / CQ - N/A"/>
         </mapping>
         <mapping>
            <identity value="rim"/>
            <map value="PQ.value, CO.value, MO.value, IVL.high or IVL.low depending on the value"/>
         </mapping>
      </element>
      <element id="Observation.valueQuantity:valueQuantity.comparator">
         <path value="Observation.valueQuantity.comparator"/>
         <short value="< | <= | >= | > - how to understand the value"/>
         <definition value="How the value should be understood and represented - whether the actual value is greater or less than the stated value due to measurement issues; e.g. if the comparator is "<" , then the real value is < stated value."/>
         <comment value="This is labeled as "Is Modifier" because the comparator modifies the interpretation of the value significantly. If there is no comparator, then there is no modification of the value."/>
         <requirements value="Need a framework for handling measures where the value is <5ug/L or >400mg/L due to the limitations of measuring methodology."/>
         <min value="0"/>
         <max value="0"/>
         <base>
            <path value="Quantity.comparator"/>
            <min value="0"/>
            <max value="1"/>
         </base>
         <type>
            <code value="code"/>
         </type>
         <meaningWhenMissing value="If there is no comparator, then there is no modification of the value"/>
         <fixedCode value="="/>
         <condition value="ele-1"/>
         <constraint>
            <key value="ele-1"/>
            <severity value="error"/>
            <human value="All FHIR elements must have a @value or children"/>
            <expression value="hasValue() | (children().count() > id.count())"/>
            <xpath value="@value|f:*|h:div"/>
         </constraint>
         <isModifier value="true"/>
         <isSummary value="true"/>
         <binding>
            <extension url="http://hl7.org/fhir/StructureDefinition/elementdefinition-bindingName">
               <valueString value="QuantityComparator"/>
            </extension>
            <strength value="required"/>
            <description value="How the Quantity should be understood and represented."/>
            <valueSetReference>
               <reference value="http://hl7.org/fhir/ValueSet/quantity-comparator"/>
            </valueSetReference>
         </binding>
         <mapping>
            <identity value="rim"/>
            <map value="n/a"/>
         </mapping>
         <mapping>
            <identity value="v2"/>
            <map value="SN.1  / CQ.1"/>
         </mapping>
         <mapping>
            <identity value="rim"/>
            <map value="IVL properties"/>
         </mapping>
      </element>
      <element id="Observation.valueQuantity:valueQuantity.unit">
         <extension url="http://hl7.org/fhir/StructureDefinition/elementdefinition-translatable">
            <valueBoolean value="true"/>
         </extension>
         <path value="Observation.valueQuantity.unit"/>
         <short value="Unit representation"/>
         <definition value="A human-readable form of the unit."/>
         <comment value="Note that FHIR strings may not exceed 1MB in size"/>
         <requirements value="There are many representations for units of measure and in many contexts, particular representations are fixed and required. I.e. mcg for micrograms."/>
         <min value="1"/>
         <max value="1"/>
         <base>
            <path value="Quantity.unit"/>
            <min value="0"/>
            <max value="1"/>
         </base>
         <type>
            <code value="string"/>
         </type>
         <condition value="ele-1"/>
         <constraint>
            <key value="ele-1"/>
            <severity value="error"/>
            <human value="All FHIR elements must have a @value or children"/>
            <expression value="hasValue() | (children().count() > id.count())"/>
            <xpath value="@value|f:*|h:div"/>
         </constraint>
         <isSummary value="true"/>
         <mapping>
            <identity value="rim"/>
            <map value="n/a"/>
         </mapping>
         <mapping>
            <identity value="v2"/>
            <map value="(see OBX.6 etc.) / CQ.2"/>
         </mapping>
         <mapping>
            <identity value="rim"/>
            <map value="PQ.unit"/>
         </mapping>
      </element>
      <element id="Observation.valueQuantity:valueQuantity.system">
         <path value="Observation.valueQuantity.system"/>
         <short value="System that defines coded unit form"/>
         <definition value="The identification of the system that provides the coded form of the unit."/>
         <comment value="see http://en.wikipedia.org/wiki/Uniform_resource_identifier"/>
         <requirements value="Need to know the system that defines the coded form of the unit."/>
         <min value="1"/>
         <max value="1"/>
         <base>
            <path value="Quantity.system"/>
            <min value="0"/>
            <max value="1"/>
         </base>
         <type>
            <code value="uri"/>
         </type>
         <fixedUri value="http://unitsofmeasure.org"/>
         <condition value="ele-1"/>
         <condition value="qty-3"/>
         <constraint>
            <key value="ele-1"/>
            <severity value="error"/>
            <human value="All FHIR elements must have a @value or children"/>
            <expression value="hasValue() | (children().count() > id.count())"/>
            <xpath value="@value|f:*|h:div"/>
         </constraint>
         <isSummary value="true"/>
         <mapping>
            <identity value="rim"/>
            <map value="n/a"/>
         </mapping>
         <mapping>
            <identity value="v2"/>
            <map value="(see OBX.6 etc.) / CQ.2"/>
         </mapping>
         <mapping>
            <identity value="rim"/>
            <map value="CO.codeSystem, PQ.translation.codeSystem"/>
         </mapping>
      </element>
      <element id="Observation.valueQuantity:valueQuantity.code">
         <path value="Observation.valueQuantity.code"/>
         <short value="Coded form of the unit"/>
         <definition value="A computer processable form of the unit in some unit representation system."/>
         <comment value="The preferred system is UCUM, but SNOMED CT can also be used (for customary units) or ISO 4217 for currency.  The context of use may additionally require a code from a particular system."/>
         <requirements value="Need a computable form of the unit that is fixed across all forms. UCUM provides this for quantities, but SNOMED CT provides many units of interest."/>
         <min value="1"/>
         <max value="1"/>
         <base>
            <path value="Quantity.code"/>
            <min value="0"/>
            <max value="1"/>
         </base>
         <type>
            <code value="code"/>
         </type>
         <condition value="ele-1"/>
         <constraint>
            <key value="ele-1"/>
            <severity value="error"/>
            <human value="All FHIR elements must have a @value or children"/>
            <expression value="hasValue() | (children().count() > id.count())"/>
            <xpath value="@value|f:*|h:div"/>
         </constraint>
         <isSummary value="true"/>
         <binding>
            <strength value="required"/>
            <description value="Body Weight Units"/>
            <valueSetReference>
               <reference value="http://hl7.org/fhir/ValueSet/ucum-bodyweight"/>
            </valueSetReference>
         </binding>
         <mapping>
            <identity value="rim"/>
            <map value="n/a"/>
         </mapping>
         <mapping>
            <identity value="v2"/>
            <map value="(see OBX.6 etc.) / CQ.2"/>
         </mapping>
         <mapping>
            <identity value="rim"/>
            <map value="PQ.code, MO.currency, PQ.translation.code"/>
         </mapping>
      </element>
      <element id="Observation.dataAbsentReason">
         <path value="Observation.dataAbsentReason"/>
         <short value="Why the result is missing"/>
         <definition value="Provides a reason why the expected value in the element Observation.value[x] is missing."/>
         <comment value="Null or exceptional values can be represented two ways in FHIR Observations.  One way is to simply include them in the value set and represent the exceptions in the value.  For example, measurement values for a serology test could be  "detected", "not detected", "inconclusive", or  "specimen unsatisfactory".   The alternate way is to use the value element for actual observations and use the explicit dataAbsentReason element to record exceptional values.  For example, the dataAbsentReason code "error" could be used when the measurement was not completed. Note that an observation may only be reported if there are values to report. For example differential cell counts values may be reported only when > 0.  Because of these options, use-case agreements are required to interpret general observations for null or exceptional values."/>
         <requirements value="For many results it is necessary to handle exceptional values in measurements."/>
         <min value="0"/>
         <max value="1"/>
         <base>
            <path value="Observation.dataAbsentReason"/>
            <min value="0"/>
            <max value="1"/>
         </base>
         <type>
            <code value="CodeableConcept"/>
         </type>
         <condition value="ele-1"/>
         <condition value="obs-6"/>
         <constraint>
            <key value="ele-1"/>
            <severity value="error"/>
            <human value="All FHIR elements must have a @value or children"/>
            <expression value="hasValue() | (children().count() > id.count())"/>
            <xpath value="@value|f:*|h:div"/>
         </constraint>
         <binding>
            <extension url="http://hl7.org/fhir/StructureDefinition/elementdefinition-bindingName">
               <valueString value="ObservationValueAbsentReason"/>
            </extension>
            <strength value="extensible"/>
            <description value="Codes specifying why the result (Observation.value[x]) is missing."/>
            <valueSetReference>
               <reference value="http://hl7.org/fhir/ValueSet/observation-valueabsentreason"/>
            </valueSetReference>
         </binding>
         <mapping>
            <identity value="rim"/>
            <map value="n/a"/>
         </mapping>
         <mapping>
            <identity value="v2"/>
            <map value="CE/CNE/CWE"/>
         </mapping>
         <mapping>
            <identity value="rim"/>
            <map value="CD"/>
         </mapping>
         <mapping>
            <identity value="orim"/>
            <map value="fhir:CodeableConcept rdfs:subClassOf dt:CD"/>
         </mapping>
         <mapping>
            <identity value="workflow"/>
            <map value="Event.notDone, Event.notDoneReason  (maps to valeu[x] or dataAbsentReason)"/>
         </mapping>
         <mapping>
            <identity value="v2"/>
            <map value="N/A"/>
         </mapping>
         <mapping>
            <identity value="rim"/>
            <map value="value.nullFlavor"/>
         </mapping>
      </element>
      <element id="Observation.dataAbsentReason.id">
         <path value="Observation.dataAbsentReason.id"/>
         <representation value="xmlAttr"/>
         <short value="xml:id (or equivalent in JSON)"/>
         <definition value="unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces."/>
         <comment value="Note that FHIR strings may not exceed 1MB in size"/>
         <min value="0"/>
         <max value="1"/>
         <base>
            <path value="Element.id"/>
            <min value="0"/>
            <max value="1"/>
         </base>
         <type>
            <code value="string"/>
         </type>
         <condition value="ele-1"/>
         <constraint>
            <key value="ele-1"/>
            <severity value="error"/>
            <human value="All FHIR elements must have a @value or children"/>
            <expression value="hasValue() | (children().count() > id.count())"/>
            <xpath value="@value|f:*|h:div"/>
         </constraint>
         <mapping>
            <identity value="rim"/>
            <map value="n/a"/>
         </mapping>
      </element>
      <element id="Observation.dataAbsentReason.extension">
         <path value="Observation.dataAbsentReason.extension"/>
         <slicing>
            <discriminator>
               <type value="value"/>
               <path value="url"/>
            </discriminator>
            <description value="Extensions are always sliced by (at least) url"/>
            <rules value="open"/>
         </slicing>
         <short value="Additional Content defined by implementations"/>
         <definition value="May be used to represent additional information that is not part of the basic definition of the element. In order to make the use of extensions safe and manageable, there is a strict set of governance  applied to the definition and use of extensions. Though any implementer is allowed to define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension."/>
         <comment value="There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions.  The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone."/>
         <alias value="extensions"/>
         <alias value="user content"/>
         <min value="0"/>
         <max value="*"/>
         <base>
            <path value="Element.extension"/>
            <min value="0"/>
            <max value="*"/>
         </base>
         <type>
            <code value="Extension"/>
         </type>
         <condition value="ele-1"/>
         <constraint>
            <key value="ele-1"/>
            <severity value="error"/>
            <human value="All FHIR elements must have a @value or children"/>
            <expression value="hasValue() | (children().count() > id.count())"/>
            <xpath value="@value|f:*|h:div"/>
         </constraint>
         <constraint>
            <key value="ext-1"/>
            <severity value="error"/>
            <human value="Must have either extensions or value[x], not both"/>
            <expression value="extension.exists() != value.exists()"/>
            <xpath value="exists(f:extension)!=exists(f:*[starts-with(local-name(.), 'value')])"/>
         </constraint>
         <mapping>
            <identity value="rim"/>
            <map value="n/a"/>
         </mapping>
         <mapping>
            <identity value="rim"/>
            <map value="N/A"/>
         </mapping>
      </element>
      <element id="Observation.dataAbsentReason.coding">
         <path value="Observation.dataAbsentReason.coding"/>
         <short value="Code defined by a terminology system"/>
         <definition value="A reference to a code defined by a terminology system."/>
         <comment value="Codes may be defined very casually in enumerations, or code lists, up to very formal definitions such as SNOMED CT - see the HL7 v3 Core Principles for more information.  Ordering of codings is undefined and SHALL NOT be used to infer meaning. Generally, at most only one of the coding values will be labeled as UserSelected = true."/>
         <requirements value="Allows for translations and alternate encodings within a code system.  Also supports communication of the same instance to systems requiring different encodings."/>
         <min value="0"/>
         <max value="*"/>
         <base>
            <path value="CodeableConcept.coding"/>
            <min value="0"/>
            <max value="*"/>
         </base>
         <type>
            <code value="Coding"/>
         </type>
         <condition value="ele-1"/>
         <constraint>
            <key value="ele-1"/>
            <severity value="error"/>
            <human value="All FHIR elements must have a @value or children"/>
            <expression value="hasValue() | (children().count() > id.count())"/>
            <xpath value="@value|f:*|h:div"/>
         </constraint>
         <isSummary value="true"/>
         <mapping>
            <identity value="rim"/>
            <map value="n/a"/>
         </mapping>
         <mapping>
            <identity value="v2"/>
            <map value="CE/CNE/CWE subset one of the sets of component 1-3 or 4-6"/>
         </mapping>
         <mapping>
            <identity value="rim"/>
            <map value="CV"/>
         </mapping>
         <mapping>
            <identity value="orim"/>
            <map value="fhir:Coding rdfs:subClassOf dt:CDCoding"/>
         </mapping>
         <mapping>
            <identity value="v2"/>
            <map value="C*E.1-8, C*E.10-22"/>
         </mapping>
         <mapping>
            <identity value="rim"/>
            <map value="union(., ./translation)"/>
         </mapping>
         <mapping>
            <identity value="orim"/>
            <map value="fhir:CodeableConcept.coding rdfs:subPropertyOf dt:CD.coding"/>
         </mapping>
      </element>
      <element id="Observation.dataAbsentReason.text">
         <extension url="http://hl7.org/fhir/StructureDefinition/elementdefinition-translatable">
            <valueBoolean value="true"/>
         </extension>
         <path value="Observation.dataAbsentReason.text"/>
         <short value="Plain text representation of the concept"/>
         <definition value="A human language representation of the concept as seen/selected/uttered by the user who entered the data and/or which represents the intended meaning of the user."/>
         <comment value="Very often the text is the same as a displayName of one of the codings."/>
         <requirements value="The codes from the terminologies do not always capture the correct meaning with all the nuances of the human using them, or sometimes there is no appropriate code at all. In these cases, the text is used to capture the full meaning of the source."/>
         <min value="0"/>
         <max value="1"/>
         <base>
            <path value="CodeableConcept.text"/>
            <min value="0"/>
            <max value="1"/>
         </base>
         <type>
            <code value="string"/>
         </type>
         <condition value="ele-1"/>
         <constraint>
            <key value="ele-1"/>
            <severity value="error"/>
            <human value="All FHIR elements must have a @value or children"/>
            <expression value="hasValue() | (children().count() > id.count())"/>
            <xpath value="@value|f:*|h:div"/>
         </constraint>
         <isSummary value="true"/>
         <mapping>
            <identity value="rim"/>
            <map value="n/a"/>
         </mapping>
         <mapping>
            <identity value="v2"/>
            <map value="C*E.9. But note many systems use C*E.2 for this"/>
         </mapping>
         <mapping>
            <identity value="rim"/>
            <map value="./originalText[mediaType/code="text/plain"]/data"/>
         </mapping>
         <mapping>
            <identity value="orim"/>
            <map value="fhir:CodeableConcept.text rdfs:subPropertyOf dt:CD.originalText"/>
         </mapping>
      </element>
      <element id="Observation.interpretation">
         <path value="Observation.interpretation"/>
         <short value="High, low, normal, etc."/>
         <definition value="The assessment made based on the result of the observation.  Intended as a simple compact code often placed adjacent to the result value in reports and flow sheets to signal the meaning/normalcy status of the result. Otherwise known as abnormal flag."/>
         <comment value="Not all terminology uses fit this general pattern. In some cases, models should not use CodeableConcept and use Coding directly and provide their own structure for managing text, codings, translations and the relationship between elements and pre- and post-coordination."/>
         <requirements value="For some results, particularly numeric results, an interpretation is necessary to fully understand the significance of a result."/>
         <alias value="Abnormal Flag"/>
         <min value="0"/>
         <max value="0"/>
         <base>
            <path value="Observation.interpretation"/>
            <min value="0"/>
            <max value="1"/>
         </base>
         <type>
            <code value="CodeableConcept"/>
         </type>
         <condition value="ele-1"/>
         <constraint>
            <key value="ele-1"/>
            <severity value="error"/>
            <human value="All FHIR elements must have a @value or children"/>
            <expression value="hasValue() | (children().count() > id.count())"/>
            <xpath value="@value|f:*|h:div"/>
         </constraint>
         <binding>
            <extension url="http://hl7.org/fhir/StructureDefinition/elementdefinition-bindingName">
               <valueString value="ObservationInterpretation"/>
            </extension>
            <strength value="extensible"/>
            <description value="Codes identifying interpretations of observations."/>
            <valueSetReference>
               <reference value="http://hl7.org/fhir/ValueSet/observation-interpretation"/>
            </valueSetReference>
         </binding>
         <mapping>
            <identity value="rim"/>
            <map value="n/a"/>
         </mapping>
         <mapping>
            <identity value="v2"/>
            <map value="CE/CNE/CWE"/>
         </mapping>
         <mapping>
            <identity value="rim"/>
            <map value="CD"/>
         </mapping>
         <mapping>
            <identity value="orim"/>
            <map value="fhir:CodeableConcept rdfs:subClassOf dt:CD"/>
         </mapping>
         <mapping>
            <identity value="sct-concept"/>
            <map value="< 260245000 |Findings values|"/>
         </mapping>
         <mapping>
            <identity value="v2"/>
            <map value="OBX-8"/>
         </mapping>
         <mapping>
            <identity value="rim"/>
            <map value="interpretationCode"/>
         </mapping>
         <mapping>
            <identity value="sct-attr"/>
            <map value="363713009 |Has interpretation|"/>
         </mapping>
      </element>
      <element id="Observation.interpretation.id">
         <path value="Observation.interpretation.id"/>
         <representation value="xmlAttr"/>
         <short value="xml:id (or equivalent in JSON)"/>
         <definition value="unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces."/>
         <comment value="Note that FHIR strings may not exceed 1MB in size"/>
         <min value="0"/>
         <max value="1"/>
         <base>
            <path value="Element.id"/>
            <min value="0"/>
            <max value="1"/>
         </base>
         <type>
            <code value="string"/>
         </type>
         <condition value="ele-1"/>
         <constraint>
            <key value="ele-1"/>
            <severity value="error"/>
            <human value="All FHIR elements must have a @value or children"/>
            <expression value="hasValue() | (children().count() > id.count())"/>
            <xpath value="@value|f:*|h:div"/>
         </constraint>
         <mapping>
            <identity value="rim"/>
            <map value="n/a"/>
         </mapping>
      </element>
      <element id="Observation.interpretation.extension">
         <path value="Observation.interpretation.extension"/>
         <slicing>
            <discriminator>
               <type value="value"/>
               <path value="url"/>
            </discriminator>
            <description value="Extensions are always sliced by (at least) url"/>
            <rules value="open"/>
         </slicing>
         <short value="Additional Content defined by implementations"/>
         <definition value="May be used to represent additional information that is not part of the basic definition of the element. In order to make the use of extensions safe and manageable, there is a strict set of governance  applied to the definition and use of extensions. Though any implementer is allowed to define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension."/>
         <comment value="There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions.  The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone."/>
         <alias value="extensions"/>
         <alias value="user content"/>
         <min value="0"/>
         <max value="*"/>
         <base>
            <path value="Element.extension"/>
            <min value="0"/>
            <max value="*"/>
         </base>
         <type>
            <code value="Extension"/>
         </type>
         <condition value="ele-1"/>
         <constraint>
            <key value="ele-1"/>
            <severity value="error"/>
            <human value="All FHIR elements must have a @value or children"/>
            <expression value="hasValue() | (children().count() > id.count())"/>
            <xpath value="@value|f:*|h:div"/>
         </constraint>
         <constraint>
            <key value="ext-1"/>
            <severity value="error"/>
            <human value="Must have either extensions or value[x], not both"/>
            <expression value="extension.exists() != value.exists()"/>
            <xpath value="exists(f:extension)!=exists(f:*[starts-with(local-name(.), 'value')])"/>
         </constraint>
         <mapping>
            <identity value="rim"/>
            <map value="n/a"/>
         </mapping>
         <mapping>
            <identity value="rim"/>
            <map value="N/A"/>
         </mapping>
      </element>
      <element id="Observation.interpretation.coding">
         <path value="Observation.interpretation.coding"/>
         <short value="Code defined by a terminology system"/>
         <definition value="A reference to a code defined by a terminology system."/>
         <comment value="Codes may be defined very casually in enumerations, or code lists, up to very formal definitions such as SNOMED CT - see the HL7 v3 Core Principles for more information.  Ordering of codings is undefined and SHALL NOT be used to infer meaning. Generally, at most only one of the coding values will be labeled as UserSelected = true."/>
         <requirements value="Allows for translations and alternate encodings within a code system.  Also supports communication of the same instance to systems requiring different encodings."/>
         <min value="0"/>
         <max value="*"/>
         <base>
            <path value="CodeableConcept.coding"/>
            <min value="0"/>
            <max value="*"/>
         </base>
         <type>
            <code value="Coding"/>
         </type>
         <condition value="ele-1"/>
         <constraint>
            <key value="ele-1"/>
            <severity value="error"/>
            <human value="All FHIR elements must have a @value or children"/>
            <expression value="hasValue() | (children().count() > id.count())"/>
            <xpath value="@value|f:*|h:div"/>
         </constraint>
         <isSummary value="true"/>
         <mapping>
            <identity value="rim"/>
            <map value="n/a"/>
         </mapping>
         <mapping>
            <identity value="v2"/>
            <map value="CE/CNE/CWE subset one of the sets of component 1-3 or 4-6"/>
         </mapping>
         <mapping>
            <identity value="rim"/>
            <map value="CV"/>
         </mapping>
         <mapping>
            <identity value="orim"/>
            <map value="fhir:Coding rdfs:subClassOf dt:CDCoding"/>
         </mapping>
         <mapping>
            <identity value="v2"/>
            <map value="C*E.1-8, C*E.10-22"/>
         </mapping>
         <mapping>
            <identity value="rim"/>
            <map value="union(., ./translation)"/>
         </mapping>
         <mapping>
            <identity value="orim"/>
            <map value="fhir:CodeableConcept.coding rdfs:subPropertyOf dt:CD.coding"/>
         </mapping>
      </element>
      <element id="Observation.interpretation.text">
         <extension url="http://hl7.org/fhir/StructureDefinition/elementdefinition-translatable">
            <valueBoolean value="true"/>
         </extension>
         <path value="Observation.interpretation.text"/>
         <short value="Plain text representation of the concept"/>
         <definition value="A human language representation of the concept as seen/selected/uttered by the user who entered the data and/or which represents the intended meaning of the user."/>
         <comment value="Very often the text is the same as a displayName of one of the codings."/>
         <requirements value="The codes from the terminologies do not always capture the correct meaning with all the nuances of the human using them, or sometimes there is no appropriate code at all. In these cases, the text is used to capture the full meaning of the source."/>
         <min value="0"/>
         <max value="1"/>
         <base>
            <path value="CodeableConcept.text"/>
            <min value="0"/>
            <max value="1"/>
         </base>
         <type>
            <code value="string"/>
         </type>
         <condition value="ele-1"/>
         <constraint>
            <key value="ele-1"/>
            <severity value="error"/>
            <human value="All FHIR elements must have a @value or children"/>
            <expression value="hasValue() | (children().count() > id.count())"/>
            <xpath value="@value|f:*|h:div"/>
         </constraint>
         <isSummary value="true"/>
         <mapping>
            <identity value="rim"/>
            <map value="n/a"/>
         </mapping>
         <mapping>
            <identity value="v2"/>
            <map value="C*E.9. But note many systems use C*E.2 for this"/>
         </mapping>
         <mapping>
            <identity value="rim"/>
            <map value="./originalText[mediaType/code="text/plain"]/data"/>
         </mapping>
         <mapping>
            <identity value="orim"/>
            <map value="fhir:CodeableConcept.text rdfs:subPropertyOf dt:CD.originalText"/>
         </mapping>
      </element>
      <element id="Observation.comment">
         <path value="Observation.comment"/>
         <short value="Comments about result"/>
         <definition value="May include statements about significant, unexpected or unreliable values, or information about the source of the value where this may be relevant to the interpretation of the result."/>
         <comment value="Note that FHIR strings may not exceed 1MB in size"/>
         <requirements value="Need to be able to provide free text additional information."/>
         <min value="0"/>
         <max value="0"/>
         <base>
            <path value="Observation.comment"/>
            <min value="0"/>
            <max value="1"/>
         </base>
         <type>
            <code value="string"/>
         </type>
         <condition value="ele-1"/>
         <constraint>
            <key value="ele-1"/>
            <severity value="error"/>
            <human value="All FHIR elements must have a @value or children"/>
            <expression value="hasValue() | (children().count() > id.count())"/>
            <xpath value="@value|f:*|h:div"/>
         </constraint>
         <mapping>
            <identity value="rim"/>
            <map value="n/a"/>
         </mapping>
         <mapping>
            <identity value="workflow"/>
            <map value="Event.note"/>
         </mapping>
         <mapping>
            <identity value="v2"/>
            <map value="NTE.3 (partner NTE to OBX, or sometimes another (child?) OBX)"/>
         </mapping>
         <mapping>
            <identity value="rim"/>
            <map value="subjectOf.observationEvent[code="annotation"].value"/>
         </mapping>
      </element>
      <element id="Observation.bodySite">
         <path value="Observation.bodySite"/>
         <short value="Observed body part"/>
         <definition value="Indicates the site on the subject's body where the observation was made (i.e. the target site)."/>
         <comment value="Only used if not implicit in code found in Observation.code.  In many systems, this may be represented as a related observation instead of an inline component.   If the use case requires BodySite to be handled as a separate resource (e.g. to identify and track separately) then use the standard extension[ body-site-instance](extension-body-site-instance.html)."/>
         <min value="0"/>
         <max value="0"/>
         <base>
            <path value="Observation.bodySite"/>
            <min value="0"/>
            <max value="1"/>
         </base>
         <type>
            <code value="CodeableConcept"/>
         </type>
         <condition value="ele-1"/>
         <constraint>
            <key value="ele-1"/>
            <severity value="error"/>
            <human value="All FHIR elements must have a @value or children"/>
            <expression value="hasValue() | (children().count() > id.count())"/>
            <xpath value="@value|f:*|h:div"/>
         </constraint>
         <binding>
            <extension url="http://hl7.org/fhir/StructureDefinition/elementdefinition-bindingName">
               <valueString value="BodySite"/>
            </extension>
            <strength value="example"/>
            <description value="Codes describing anatomical locations. May include laterality."/>
            <valueSetReference>
               <reference value="http://hl7.org/fhir/ValueSet/body-site"/>
            </valueSetReference>
         </binding>
         <mapping>
            <identity value="rim"/>
            <map value="n/a"/>
         </mapping>
         <mapping>
            <identity value="v2"/>
            <map value="CE/CNE/CWE"/>
         </mapping>
         <mapping>
            <identity value="rim"/>
            <map value="CD"/>
         </mapping>
         <mapping>
            <identity value="orim"/>
            <map value="fhir:CodeableConcept rdfs:subClassOf dt:CD"/>
         </mapping>
         <mapping>
            <identity value="sct-concept"/>
            <map value="< 123037004 |Body structure|"/>
         </mapping>
         <mapping>
            <identity value="v2"/>
            <map value="OBX-20"/>
         </mapping>
         <mapping>
            <identity value="rim"/>
            <map value="targetSiteCode"/>
         </mapping>
         <mapping>
            <identity value="sct-attr"/>
            <map value="718497002 |Inherent location|"/>
         </mapping>
      </element>
      <element id="Observation.bodySite.id">
         <path value="Observation.bodySite.id"/>
         <representation value="xmlAttr"/>
         <short value="xml:id (or equivalent in JSON)"/>
         <definition value="unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces."/>
         <comment value="Note that FHIR strings may not exceed 1MB in size"/>
         <min value="0"/>
         <max value="1"/>
         <base>
            <path value="Element.id"/>
            <min value="0"/>
            <max value="1"/>
         </base>
         <type>
            <code value="string"/>
         </type>
         <condition value="ele-1"/>
         <constraint>
            <key value="ele-1"/>
            <severity value="error"/>
            <human value="All FHIR elements must have a @value or children"/>
            <expression value="hasValue() | (children().count() > id.count())"/>
            <xpath value="@value|f:*|h:div"/>
         </constraint>
         <mapping>
            <identity value="rim"/>
            <map value="n/a"/>
         </mapping>
      </element>
      <element id="Observation.bodySite.extension">
         <path value="Observation.bodySite.extension"/>
         <slicing>
            <discriminator>
               <type value="value"/>
               <path value="url"/>
            </discriminator>
            <description value="Extensions are always sliced by (at least) url"/>
            <rules value="open"/>
         </slicing>
         <short value="Additional Content defined by implementations"/>
         <definition value="May be used to represent additional information that is not part of the basic definition of the element. In order to make the use of extensions safe and manageable, there is a strict set of governance  applied to the definition and use of extensions. Though any implementer is allowed to define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension."/>
         <comment value="There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions.  The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone."/>
         <alias value="extensions"/>
         <alias value="user content"/>
         <min value="0"/>
         <max value="*"/>
         <base>
            <path value="Element.extension"/>
            <min value="0"/>
            <max value="*"/>
         </base>
         <type>
            <code value="Extension"/>
         </type>
         <condition value="ele-1"/>
         <constraint>
            <key value="ele-1"/>
            <severity value="error"/>
            <human value="All FHIR elements must have a @value or children"/>
            <expression value="hasValue() | (children().count() > id.count())"/>
            <xpath value="@value|f:*|h:div"/>
         </constraint>
         <constraint>
            <key value="ext-1"/>
            <severity value="error"/>
            <human value="Must have either extensions or value[x], not both"/>
            <expression value="extension.exists() != value.exists()"/>
            <xpath value="exists(f:extension)!=exists(f:*[starts-with(local-name(.), 'value')])"/>
         </constraint>
         <mapping>
            <identity value="rim"/>
            <map value="n/a"/>
         </mapping>
         <mapping>
            <identity value="rim"/>
            <map value="N/A"/>
         </mapping>
      </element>
      <element id="Observation.bodySite.coding">
         <path value="Observation.bodySite.coding"/>
         <slicing>
            <discriminator>
               <type value="value"/>
               <path value="system"/>
            </discriminator>
            <ordered value="false"/>
            <rules value="open"/>
         </slicing>
         <short value="Code defined by a terminology system"/>
         <definition value="A reference to a code defined by a terminology system."/>
         <comment value="Codes may be defined very casually in enumerations, or code lists, up to very formal definitions such as SNOMED CT - see the HL7 v3 Core Principles for more information.  Ordering of codings is undefined and SHALL NOT be used to infer meaning. Generally, at most only one of the coding values will be labeled as UserSelected = true."/>
         <requirements value="Allows for translations and alternate encodings within a code system.  Also supports communication of the same instance to systems requiring different encodings."/>
         <min value="0"/>
         <max value="*"/>
         <base>
            <path value="CodeableConcept.coding"/>
            <min value="0"/>
            <max value="*"/>
         </base>
         <type>
            <code value="Coding"/>
         </type>
         <condition value="ele-1"/>
         <constraint>
            <key value="ele-1"/>
            <severity value="error"/>
            <human value="All FHIR elements must have a @value or children"/>
            <expression value="hasValue() | (children().count() > id.count())"/>
            <xpath value="@value|f:*|h:div"/>
         </constraint>
         <isSummary value="true"/>
         <mapping>
            <identity value="rim"/>
            <map value="n/a"/>
         </mapping>
         <mapping>
            <identity value="v2"/>
            <map value="CE/CNE/CWE subset one of the sets of component 1-3 or 4-6"/>
         </mapping>
         <mapping>
            <identity value="rim"/>
            <map value="CV"/>
         </mapping>
         <mapping>
            <identity value="orim"/>
            <map value="fhir:Coding rdfs:subClassOf dt:CDCoding"/>
         </mapping>
         <mapping>
            <identity value="v2"/>
            <map value="C*E.1-8, C*E.10-22"/>
         </mapping>
         <mapping>
            <identity value="rim"/>
            <map value="union(., ./translation)"/>
         </mapping>
         <mapping>
            <identity value="orim"/>
            <map value="fhir:CodeableConcept.coding rdfs:subPropertyOf dt:CD.coding"/>
         </mapping>
      </element>
      <element id="Observation.bodySite.coding:snomedCT">
         <path value="Observation.bodySite.coding"/>
         <sliceName value="snomedCT"/>
         <short value="Code defined by a terminology system"/>
         <definition value="A reference to a code defined by a terminology system."/>
         <comment value="Codes may be defined very casually in enumerations, or code lists, up to very formal definitions such as SNOMED CT - see the HL7 v3 Core Principles for more information.  Ordering of codings is undefined and SHALL NOT be used to infer meaning. Generally, at most only one of the coding values will be labeled as UserSelected = true."/>
         <requirements value="Allows for translations and alternate encodings within a code system.  Also supports communication of the same instance to systems requiring different encodings."/>
         <min value="0"/>
         <max value="1"/>
         <base>
            <path value="CodeableConcept.coding"/>
            <min value="0"/>
            <max value="*"/>
         </base>
         <type>
            <code value="Coding"/>
         </type>
         <condition value="ele-1"/>
         <constraint>
            <key value="ele-1"/>
            <severity value="error"/>
            <human value="All FHIR elements must have a @value or children"/>
            <expression value="hasValue() | (children().count() > id.count())"/>
            <xpath value="@value|f:*|h:div"/>
         </constraint>
         <isSummary value="true"/>
         <mapping>
            <identity value="rim"/>
            <map value="n/a"/>
         </mapping>
         <mapping>
            <identity value="v2"/>
            <map value="CE/CNE/CWE subset one of the sets of component 1-3 or 4-6"/>
         </mapping>
         <mapping>
            <identity value="rim"/>
            <map value="CV"/>
         </mapping>
         <mapping>
            <identity value="orim"/>
            <map value="fhir:Coding rdfs:subClassOf dt:CDCoding"/>
         </mapping>
         <mapping>
            <identity value="v2"/>
            <map value="C*E.1-8, C*E.10-22"/>
         </mapping>
         <mapping>
            <identity value="rim"/>
            <map value="union(., ./translation)"/>
         </mapping>
         <mapping>
            <identity value="orim"/>
            <map value="fhir:CodeableConcept.coding rdfs:subPropertyOf dt:CD.coding"/>
         </mapping>
      </element>
      <element id="Observation.bodySite.coding:snomedCT.id">
         <path value="Observation.bodySite.coding.id"/>
         <representation value="xmlAttr"/>
         <short value="xml:id (or equivalent in JSON)"/>
         <definition value="unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces."/>
         <comment value="Note that FHIR strings may not exceed 1MB in size"/>
         <min value="0"/>
         <max value="1"/>
         <base>
            <path value="Element.id"/>
            <min value="0"/>
            <max value="1"/>
         </base>
         <type>
            <code value="string"/>
         </type>
         <condition value="ele-1"/>
         <constraint>
            <key value="ele-1"/>
            <severity value="error"/>
            <human value="All FHIR elements must have a @value or children"/>
            <expression value="hasValue() | (children().count() > id.count())"/>
            <xpath value="@value|f:*|h:div"/>
         </constraint>
         <mapping>
            <identity value="rim"/>
            <map value="n/a"/>
         </mapping>
      </element>
      <element id="Observation.bodySite.coding:snomedCT.extension">
         <path value="Observation.bodySite.coding.extension"/>
         <slicing>
            <discriminator>
               <type value="value"/>
               <path value="url"/>
            </discriminator>
            <description value="Extensions are always sliced by (at least) url"/>
            <rules value="open"/>
         </slicing>
         <short value="Additional Content defined by implementations"/>
         <definition value="May be used to represent additional information that is not part of the basic definition of the element. In order to make the use of extensions safe and manageable, there is a strict set of governance  applied to the definition and use of extensions. Though any implementer is allowed to define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension."/>
         <comment value="There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions.  The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone."/>
         <alias value="extensions"/>
         <alias value="user content"/>
         <min value="0"/>
         <max value="*"/>
         <base>
            <path value="Element.extension"/>
            <min value="0"/>
            <max value="*"/>
         </base>
         <type>
            <code value="Extension"/>
         </type>
         <condition value="ele-1"/>
         <constraint>
            <key value="ele-1"/>
            <severity value="error"/>
            <human value="All FHIR elements must have a @value or children"/>
            <expression value="hasValue() | (children().count() > id.count())"/>
            <xpath value="@value|f:*|h:div"/>
         </constraint>
         <constraint>
            <key value="ext-1"/>
            <severity value="error"/>
            <human value="Must have either extensions or value[x], not both"/>
            <expression value="extension.exists() != value.exists()"/>
            <xpath value="exists(f:extension)!=exists(f:*[starts-with(local-name(.), 'value')])"/>
         </constraint>
         <mapping>
            <identity value="rim"/>
            <map value="n/a"/>
         </mapping>
         <mapping>
            <identity value="rim"/>
            <map value="N/A"/>
         </mapping>
      </element>
      <element id="Observation.bodySite.coding:snomedCT.extension:snomedCTDescriptionID">
         <path value="Observation.bodySite.coding.extension"/>
         <sliceName value="snomedCTDescriptionID"/>
         <short value="The SNOMED CT Description ID for the display"/>
         <definition value="The SNOMED CT Description ID for the display."/>
         <comment value="There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions.  The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone."/>
         <alias value="extensions"/>
         <alias value="user content"/>
         <min value="0"/>
         <max value="1"/>
         <base>
            <path value="Element.extension"/>
            <min value="0"/>
            <max value="*"/>
         </base>
         <type>
            <code value="Extension"/>
            <profile value="https://fhir.hl7.org.uk/STU3/StructureDefinition/Extension-coding-sctdescid"/>
         </type>
         <condition value="ele-1"/>
         <constraint>
            <key value="ele-1"/>
            <severity value="error"/>
            <human value="All FHIR elements must have a @value or children"/>
            <expression value="hasValue() | (children().count() > id.count())"/>
            <xpath value="@value|f:*|h:div"/>
         </constraint>
         <constraint>
            <key value="ext-1"/>
            <severity value="error"/>
            <human value="Must have either extensions or value[x], not both"/>
            <expression value="extension.exists() != value.exists()"/>
            <xpath value="exists(f:extension)!=exists(f:*[starts-with(local-name(.), 'value')])"/>
         </constraint>
         <mapping>
            <identity value="rim"/>
            <map value="n/a"/>
         </mapping>
         <mapping>
            <identity value="rim"/>
            <map value="N/A"/>
         </mapping>
      </element>
      <element id="Observation.bodySite.coding:snomedCT.extension:snomedCTDescriptionID.id">
         <path value="Observation.bodySite.coding.extension.id"/>
         <representation value="xmlAttr"/>
         <short value="xml:id (or equivalent in JSON)"/>
         <definition value="unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces."/>
         <comment value="Note that FHIR strings may not exceed 1MB in size"/>
         <min value="0"/>
         <max value="1"/>
         <base>
            <path value="Element.id"/>
            <min value="0"/>
            <max value="1"/>
         </base>
         <type>
            <code value="string"/>
         </type>
         <condition value="ele-1"/>
         <constraint>
            <key value="ele-1"/>
            <severity value="error"/>
            <human value="All FHIR elements must have a @value or children"/>
            <expression value="hasValue() | (children().count() > id.count())"/>
            <xpath value="@value|f:*|h:div"/>
         </constraint>
         <mapping>
            <identity value="rim"/>
            <map value="n/a"/>
         </mapping>
      </element>
      <element id="Observation.bodySite.coding:snomedCT.extension:snomedCTDescriptionID.extension">
         <path value="Observation.bodySite.coding.extension.extension"/>
         <slicing>
            <discriminator>
               <type value="value"/>
               <path value="url"/>
            </discriminator>
            <description value="Extensions are always sliced by (at least) url"/>
            <rules value="open"/>
         </slicing>
         <short value="Additional Content defined by implementations"/>
         <definition value="May be used to represent additional information that is not part of the basic definition of the element. In order to make the use of extensions safe and manageable, there is a strict set of governance  applied to the definition and use of extensions. Though any implementer is allowed to define an extension, there is a set of requirements that SHALL be met as part of the definition of the extension."/>
         <comment value="There can be no stigma associated with the use of extensions by any application, project, or standard - regardless of the institution or jurisdiction that uses or defines the extensions.  The use of extensions is what allows the FHIR specification to retain a core level of simplicity for everyone."/>
         <alias value="extensions"/>
         <alias value="user content"/>
         <min value="0"/>
         <max value="*"/>
         <base>
            <path value="Element.extension"/>
            <min value="0"/>
            <max value="*"/>
         </base>
         <type>
            <code value="Extension"/>
         </type>
         <condition value="ele-1"/>
         <constraint>
            <key value="ele-1"/>
            <severity value="error"/>
            <human value="All FHIR elements must have a @value or children"/>
            <expression value="hasValue() | (children().count() > id.count())"/>
            <xpath value="@value|f:*|h:div"/>
         </constraint>
         <constraint>
            <key value="ext-1"/>
            <severity value="error"/>
            <human value="Must have either extensions or value[x], not both"/>
            <expression value="extension.exists() != value.exists()"/>
            <xpath