<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.code.coding.system">
      <path value="Observation.code.coding.system" />
      <code>
        <system value="http://snomed.info/sct" />
        <code value="118230007" />
        <display value="Hearing finding" />
      </code>
      <fixedUri value="http://snomed.info/wct" />
    </element>
    <element id="Observation.code.coding.code">
      <path value="Observation.code.coding.code" />
      <code>
        <system value="http://snomed.info/sct" />
        <code value="118230007" />
        <display value="Hearing finding" />
      </code>
    </element>
    <element id="Observation.subject.reference">
      <path value="Observation.subject.reference" />
      <min value="1" />
      <type>
        <code value="string" />
        <profile value="https://example.org/fhir/StructureDefinition/MyPatient" />
      </type>
    </element>
    <element id="Observation.subject.reference.identifier">
      <path value="Observation.subject.reference.identifier" />
      <slicing>
        <discriminator>
          <type value="value" />
          <path value="system" />
        </discriminator>
        <rules value="open" />
      </slicing>
      <min value="1" />
    </element>
    <element id="Observation.effective[x]">
      <path value="Observation.effective[x]" />
      <label value="TestDate" />
      <min value="1" />
      <type>
        <code value="dateTime" />
      </type>
      <type>
        <code value="Timing" />
      </type>
    </element>
    <element id="Observation.method">
      <path value="Observation.method" />
      <label value="Stimulus" />
      <min value="1" />
    </element>
    <element id="Observation.derivedFrom">
      <path value="Observation.derivedFrom" />
      <max value="1" />
      <type>
        <code value="Reference" />
        <targetProfile value="http://hl7.org/fhir/StructureDefinition/Media" />
      </type>
    </element>
    <element id="Observation.component.referenceRange">
      <path value="Observation.component.referenceRange" />
      <contentReference value="http://hl7.org/fhir/StructureDefinition/Observation#Observation.referenceRange" />
    </element>
  </differential>
</StructureDefinition>