<StructureDefinition xmlns="http://hl7.org/fhir">
  <url value="https://example.org/fhir/StructureDefinition/MyObservation" />
  <name value="MyObservation" />
  <status value="draft" />
  <fhirVersion value="4.0.1" />
  <kind value="resource" />
  <abstract value="false" />
  <type value="Observation" />
  <baseDefinition value="http://hl7.org/fhir/StructureDefinition/Observation" />
  <derivation value="constraint" />
  <differential>
    <element id="Observation.subject">
      <path value="Observation.subject" />
      <min value="1" />
    </element>
    <element id="Observation.subject.reference">
      <path value="Observation.subject.reference" />
      <short value="患者 Resource Link" />
      <min value="1" />
    </element>
    <element id="Observation.encounter">
      <path value="Observation.encounter" />
      <min value="1" />
    </element>
    <element id="Observation.encounter.reference">
      <path value="Observation.encounter.reference" />
      <min value="1" />
    </element>
  </differential>
</StructureDefinition>