<StructureDefinition xmlns="http://hl7.org/fhir">
  <url value="https://www.medizininformatik-initiative.de/fhir/core/StructureDefinition/MII-Reference" />
  <version value="1.0" />
  <name value="MII-Reference" />
  <status value="retired" />
  <description value="Einheitliche Vorgabe zur Verwendung von Logical References" />
  <fhirVersion value="4.0.1" />
  <mapping>
    <identity value="rim" />
    <uri value="http://hl7.org/v3" />
    <name value="RIM Mapping" />
  </mapping>
  <kind value="complex-type" />
  <abstract value="false" />
  <type value="Reference" />
  <baseDefinition value="http://hl7.org/fhir/StructureDefinition/Reference" />
  <derivation value="constraint" />
  <differential>
    <element id="Reference">
      <path value="Reference" />
      <constraint>
        <key value="mii-reference-1" />
        <severity value="error" />
        <human value="Either reference.reference OR reference.identifier exists" />
        <expression value="($this.reference.exists() or ($this.identifier.value.exists() and $this.identifier.system.exists())) xor $this.extension('http://hl7.org/fhir/StructureDefinition/data-absent-reason').exists()" />
        <source value="https://www.medizininformatik-initiative.de/fhir/core/StructureDefinition/MII-Reference" />
      </constraint>
    </element>
    <element id="Reference.reference">
      <path value="Reference.reference" />
      <mustSupport value="true" />
    </element>
    <element id="Reference.identifier">
      <path value="Reference.identifier" />
      <mustSupport value="true" />
    </element>
    <element id="Reference.identifier.system">
      <path value="Reference.identifier.system" />
      <min value="1" />
      <mustSupport value="true" />
    </element>
    <element id="Reference.identifier.value">
      <path value="Reference.identifier.value" />
      <min value="1" />
      <mustSupport value="true" />
    </element>
  </differential>
</StructureDefinition>