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Explore and Make use of Nationally Defined Messaging APIs

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<?xml version="1.0" encoding="UTF-8" standalone="no"?><OperationDefinition xmlns="http://hl7.org/fhir">
   <id value="eRS-MaintainReferralLetter-Operation-1"/>
   <url value="https://fhir.nhs.uk/STU3/OperationDefinition/eRS-MaintainReferralLetter-Operation-1"/>
   <version value="1.0.0"/>
   <name value="eRS-MaintainReferralLetter-Operation-1"/>
   <status value="draft"/>
   <kind value="operation"/>
   <date value="2019-01-21T00:00:00+01:00"/>
   <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="eRS Maintain Referral Letter."/>
   <code value="ers.maintainReferralLetter"/>
   <system value="false"/>
   <type value="true"/>
   <instance value="false"/>
   <parameter>
      <name value="referralLetterFile"/>
      <use value="in"/>
      <min value="1"/>
      <max value="*"/>
      <documentation value="The reference to the DocumentReference profile"/>
      <type value="DocumentReference"/>
      <profile>
         <reference value="https://fhir.nhs.uk/STU3/StructureDefinition/eRS-DocumentReference-1"/>
      </profile>
   </parameter>
   <parameter>
      <name value="referral"/>
      <use value="out"/>
      <min value="1"/>
      <max value="1"/>
      <documentation value="The referral request that will be created."/>
      <type value="ReferralRequest"/>
      <profile>
         <reference value="https://fhir.nhs.uk/STU3/StructureDefinition/eRS-ReferralRequest-1"/>
      </profile>
   </parameter>
</OperationDefinition>