<StructureDefinition xmlns="http://hl7.org/fhir">
  <url value="https://example.org/fhir/StructureDefinition/TrainingObservation" />
  <name value="TrainingObservation" />
  <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="training-1" />
        <severity value="error" />
        <human value="ValueQuantity or Note are not available." />
        <expression value="value.ofType(Quantity).exists() or note.exists()" />
      </constraint>
    </element>
    <element id="Observation.extension:testEnvironment">
      <path value="Observation.extension" />
      <sliceName value="testEnvironment" />
      <definition value="The environment in which the test took place." />
      <type>
        <code value="Extension" />
        <profile value="https://example.org/fhir/StructureDefinition/Environment" />
      </type>
      <isModifier value="false" />
    </element>
    <element id="Observation.subject">
      <path value="Observation.subject" />
      <type>
        <code value="Reference" />
        <targetProfile value="https://example.org/fhir/StructureDefinition/MyAlpCorePatient" />
      </type>
    </element>
    <element id="Observation.value[x]">
      <path value="Observation.value[x]" />
      <condition value="training-1" />
    </element>
    <element id="Observation.note">
      <path value="Observation.note" />
      <condition value="training-1" />
    </element>
    <element id="Observation.bodySite.extension:laterality">
      <path value="Observation.bodySite.extension" />
      <sliceName value="laterality" />
      <type>
        <code value="Extension" />
        <profile value="https://example.org/fhir/StructureDefinition/laterality" />
      </type>
      <isModifier value="false" />
    </element>
  </differential>
</StructureDefinition>