<StructureDefinition xmlns="http://hl7.org/fhir">
  <url value="https://example.org/fhir/StructureDefinition/Wayfinder-UKCore-DocumentReference" />
  <name value="WayfinderUKCoreDocumentReference" />
  <status value="draft" />
  <fhirVersion value="4.0.1" />
  <kind value="resource" />
  <abstract value="false" />
  <type value="DocumentReference" />
  <baseDefinition value="https://fhir.hl7.org.uk/StructureDefinition/UKCore-DocumentReference" />
  <derivation value="constraint" />
  <differential>
    <element id="DocumentReference.id">
      <path value="DocumentReference.id" />
      <min value="1" />
    </element>
    <element id="DocumentReference.extension:extensionWayfinderDocumentReadReceipt">
      <path value="DocumentReference.extension" />
      <sliceName value="extensionWayfinderDocumentReadReceipt" />
      <type>
        <code value="Extension" />
        <profile value="https://fhir.nhs.uk/StructureDefinition/Extension-Document-ReadReceipt" />
      </type>
      <isModifier value="false" />
    </element>
    <element id="DocumentReference.identifier.system">
      <path value="DocumentReference.identifier.system" />
      <min value="1" />
    </element>
    <element id="DocumentReference.identifier.value">
      <path value="DocumentReference.identifier.value" />
      <min value="1" />
    </element>
    <element id="DocumentReference.status">
      <path value="DocumentReference.status" />
      <short value="current" />
    </element>
    <element id="DocumentReference.docStatus">
      <path value="DocumentReference.docStatus" />
      <short value="final | amended | corrected | appended" />
    </element>
    <element id="DocumentReference.subject">
      <path value="DocumentReference.subject" />
      <min value="1" />
    </element>
    <element id="DocumentReference.subject.type">
      <path value="DocumentReference.subject.type" />
      <min value="1" />
    </element>
    <element id="DocumentReference.subject.identifier">
      <path value="DocumentReference.subject.identifier" />
      <min value="1" />
    </element>
    <element id="DocumentReference.subject.identifier.system">
      <path value="DocumentReference.subject.identifier.system" />
      <min value="1" />
    </element>
    <element id="DocumentReference.subject.identifier.value">
      <path value="DocumentReference.subject.identifier.value" />
      <min value="1" />
    </element>
    <element id="DocumentReference.date">
      <path value="DocumentReference.date" />
      <min value="1" />
    </element>
    <element id="DocumentReference.custodian">
      <path value="DocumentReference.custodian" />
      <min value="1" />
    </element>
    <element id="DocumentReference.custodian.type">
      <path value="DocumentReference.custodian.type" />
      <short value="Organization" />
      <min value="1" />
    </element>
    <element id="DocumentReference.custodian.identifier">
      <path value="DocumentReference.custodian.identifier" />
      <min value="1" />
    </element>
    <element id="DocumentReference.custodian.identifier.system">
      <path value="DocumentReference.custodian.identifier.system" />
      <min value="1" />
    </element>
    <element id="DocumentReference.custodian.identifier.value">
      <path value="DocumentReference.custodian.identifier.value" />
      <min value="1" />
    </element>
    <element id="DocumentReference.custodian.display">
      <path value="DocumentReference.custodian.display" />
      <min value="1" />
    </element>
    <element id="DocumentReference.description">
      <path value="DocumentReference.description" />
      <min value="1" />
    </element>
    <element id="DocumentReference.content">
      <path value="DocumentReference.content" />
      <max value="1" />
    </element>
    <element id="DocumentReference.content.attachment.contentType">
      <path value="DocumentReference.content.attachment.contentType" />
      <short value="application | pdf" />
      <min value="1" />
    </element>
    <element id="DocumentReference.content.attachment.url">
      <path value="DocumentReference.content.attachment.url" />
      <min value="1" />
    </element>
    <element id="DocumentReference.context.period">
      <path value="DocumentReference.context.period" />
      <min value="1" />
    </element>
    <element id="DocumentReference.context.period.start">
      <path value="DocumentReference.context.period.start" />
      <min value="1" />
    </element>
    <element id="DocumentReference.context.related.reference">
      <path value="DocumentReference.context.related.reference" />
      <min value="1" />
    </element>
    <element id="DocumentReference.context.related.type">
      <path value="DocumentReference.context.related.type" />
      <short value="Appointment" />
      <min value="1" />
    </element>
  </differential>
</StructureDefinition>