<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">
      <path value="Observation" />
      <constraint>
        <key value="myown-value-constraint" />
        <severity value="error" />
        <human value="You have to fill in value or note." />
        <expression value="value.exists() or note.exists()" />
      </constraint>
    </element>
    <element id="Observation.code.coding.system">
      <path value="Observation.code.coding.system" />
      <short value="http://snomed.info/sct" />
      <min value="1" />
    </element>
    <element id="Observation.code.coding.code">
      <path value="Observation.code.coding.code" />
      <min value="1" />
      <fixedCode value="118230007" />
    </element>
    <element id="Observation.code.coding.display">
      <path value="Observation.code.coding.display" />
      <fixedString value="Hearing finding (finding)" />
    </element>
    <element id="Observation.subject">
      <path value="Observation.subject" />
      <min value="1" />
      <type>
        <code value="Reference" />
        <targetProfile value="https://example.org/fhir/StructureDefinition/MyPatient" />
      </type>
    </element>
    <element id="Observation.effective[x]">
      <path value="Observation.effective[x]" />
      <min value="1" />
      <type>
        <code value="dateTime" />
      </type>
    </element>
    <element id="Observation.value[x]">
      <path value="Observation.value[x]" />
      <min value="1" />
      <type>
        <code value="CodeableConcept" />
      </type>
      <condition value="myown-value-constraint" />
    </element>
    <element id="Observation.note">
      <path value="Observation.note" />
      <mustSupport value="true" />
    </element>
    <element id="Observation.method">
      <path value="Observation.method" />
      <min value="1" />
      <mustSupport value="true" />
    </element>
    <element id="Observation.device">
      <path value="Observation.device" />
      <mustSupport value="true" />
    </element>
    <element id="Observation.derivedFrom">
      <path value="Observation.derivedFrom" />
      <mustSupport value="true" />
    </element>
    <element id="Observation.component.referenceRange">
      <path value="Observation.component.referenceRange" />
      <contentReference value="http://hl7.org/fhir/StructureDefinition/Observation#Observation.referenceRange" />
    </element>
  </differential>
</StructureDefinition>