<StructureDefinition xmlns="http://hl7.org/fhir">
  <id value="BARSMessageHeaderBookingRequest" />
  <url value="https://fhir.nhs.uk/StructureDefinition/BARSMessageHeader-booking-request" />
  <version value="1.0.1" />
  <name value="BARSMessageHeaderBookingRequest" />
  <title value="BARS MessageHeader - Booking-Request" />
  <status value="active" />
  <date value="2022-04-20" />
  <description value="BARSMessageHeader Booking Request profile" />
  <fhirVersion value="4.0.1" />
  <kind value="resource" />
  <abstract value="false" />
  <type value="MessageHeader" />
  <baseDefinition value="https://fhir.hl7.org.uk/StructureDefinition/UKCore-MessageHeader" />
  <derivation value="constraint" />
  <differential>
    <element id="MessageHeader.event[x]">
      <path value="MessageHeader.event[x]" />
      <type>
        <code value="Coding" />
      </type>
      <binding>
        <strength value="required" />
        <valueSet value="https://fhir.nhs.uk/ValueSet/NHSDigital-message-events" />
      </binding>
    </element>
    <element id="MessageHeader.event[x].system">
      <path value="MessageHeader.event[x].system" />
      <fixedUri value="https://fhir.nhs.uk/CodeSystem/message-events-bars" />
    </element>
    <element id="MessageHeader.event[x].code">
      <path value="MessageHeader.event[x].code" />
      <comment value="This will be a set of fixed values that are used to trigger use case specific processing when the bundle is received (refer to guidance for definitions etc..)" />
      <min value="1" />
      <fixedCode value="booking-request" />
    </element>
    <element id="MessageHeader.destination">
      <path value="MessageHeader.destination" />
      <min value="1" />
    </element>
    <element id="MessageHeader.destination.receiver.reference">
      <path value="MessageHeader.destination.receiver.reference" />
      <min value="1" />
    </element>
    <element id="MessageHeader.sender.reference">
      <path value="MessageHeader.sender.reference" />
      <min value="1" />
    </element>
    <element id="MessageHeader.sender.identifier.assigner.reference">
      <path value="MessageHeader.sender.identifier.assigner.reference" />
      <comment value="Reference to the Requester Organisation" />
      <min value="1" />
    </element>
    <element id="MessageHeader.source.extension">
      <path value="MessageHeader.source.extension" />
      <slicing>
        <discriminator>
          <type value="value" />
          <path value="url" />
        </discriminator>
        <rules value="open" />
      </slicing>
      <min value="0" />
    </element>
    <element id="MessageHeader.source.extension:myExtension">
      <path value="MessageHeader.source.extension" />
      <sliceName value="myExtension" />
      <min value="0" />
      <type>
        <code value="Extension" />
        <profile value="https://fhir.nhs.uk/StructureDefinition/CDSSExtension" />
      </type>
    </element>
    <element id="MessageHeader.source.name">
      <path value="MessageHeader.source.name" />
      <comment value="EMS Supplier company/ product name" />
    </element>
    <element id="MessageHeader.source.version">
      <path value="MessageHeader.source.version" />
      <comment value="EMS software version" />
    </element>
    <element id="MessageHeader.source.endpoint">
      <path value="MessageHeader.source.endpoint" />
      <comment value="The uri of the Requester’s endpoint" />
    </element>
    <element id="MessageHeader.reason">
      <path value="MessageHeader.reason" />
      <min value="1" />
    </element>
    <element id="MessageHeader.reason.coding.system">
      <path value="MessageHeader.reason.coding.system" />
      <comment value="BARS Event lifecycle &quot;new&quot;, &quot;update&quot;" />
      <fixedUri value="https://fhir.nhs.uk/CodeSystem/message-reason-bars" />
    </element>
    <element id="MessageHeader.focus.reference">
      <path value="MessageHeader.focus.reference" />
      <comment value="This MUST reference the UKCore-ServiceRequest resource." />
      <min value="1" />
    </element>
  </differential>
</StructureDefinition>