<status value="active" /> <date value="2023-03-08" /> <description value="BARSMessageHeader ServiceRequest 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].system"> <path value="MessageHeader.event[x].system" /> <min value="1" /> </element> <element id="MessageHeader.event[x].code"> <path value="MessageHeader.event[x].code" /> <min value="1" /> </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" /> <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.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" /> <fixedUri value="https://fhir.nhs.uk/CodeSystem/message-reason-bars" /> </element> <element id="MessageHeader.focus.reference"> <path value="MessageHeader.focus.reference" /> <min value="1" /> </element> </differential> </StructureDefinition>