<StructureDefinition xmlns="http://hl7.org/fhir">
  <url value="http://training.example.org/StructureDefinition/patient-occupation" />
  <version value="1.0.0" />
  <name value="patient-occupation" />
  <status value="draft" />
  <date value="2018-09-23T14:46:53.354+00:00" />
  <description value="This complex extension can be used to capture a patient's occupation and the time period for that occupation" />
  <fhirVersion value="3.0.1" />
  <kind value="complex-type" />
  <abstract value="false" />
  <contextType value="resource" />
  <context value="Patient" />
  <type value="Extension" />
  <baseDefinition value="http://hl7.org/fhir/StructureDefinition/Extension" />
  <derivation value="constraint" />
  <snapshot />
  <differential>
    <element id="Extension">
      <path value="Extension" />
      <short value="Optional Extensions Element" />
      <definition value="Optional Extension Element - found in all resources." />
      <base>
        <path value="Element" />
        <min value="0" />
        <max value="*" />
      </base>
      <constraint>
        <key value="ext-1" />
        <severity value="error" />
        <human value="Must have either extensions or value[x], not both" />
        <expression value="extension.exists() != value.exists()" />
        <xpath value="exists(f:extension)!=exists(f:*[starts-with(local-name(.), 'value')])" />
      </constraint>
      <mapping>
        <identity value="rim" />
        <map value="N/A" />
      </mapping>
    </element>
    <element id="Extension.extension">
      <path value="Extension.extension" />
      <slicing>
        <discriminator>
          <type value="value" />
          <path value="url" />
        </discriminator>
        <rules value="open" />
      </slicing>
    </element>
    <element id="Extension.extension:code">
      <path value="Extension.extension" />
      <sliceName value="code" />
      <min value="1" />
      <max value="1" />
    </element>
    <element id="Extension.extension:code.url">
      <path value="Extension.extension.url" />
      <fixedUri value="code" />
    </element>
    <element id="Extension.extension:code.value[x]:valueCodeableConcept">
      <path value="Extension.extension.valueCodeableConcept" />
      <sliceName value="valueCodeableConcept" />
      <type>
        <code value="CodeableConcept" />
      </type>
    </element>
    <element id="Extension.extension:period">
      <path value="Extension.extension" />
      <sliceName value="period" />
      <min value="1" />
      <max value="1" />
    </element>
    <element id="Extension.extension:period.url">
      <path value="Extension.extension.url" />
      <fixedUri value="period" />
    </element>
    <element id="Extension.extension:period.value[x]:valuePeriod">
      <path value="Extension.extension.valuePeriod" />
      <sliceName value="valuePeriod" />
      <type>
        <code value="Period" />
      </type>
    </element>
    <element id="Extension.url">
      <path value="Extension.url" />
      <fixedUri value="http://training.example.org/StructureDefinition/patient-occupation" />
    </element>
    <element id="Extension.value[x]">
      <path value="Extension.value[x]" />
      <max value="0" />
    </element>
  </differential>
</StructureDefinition>