<StructureDefinition xmlns="http://hl7.org/fhir">
  <id value="performer" />
  <url value="http://ihis.sg/extension/performer" />
  <name value="Performer" />
  <status value="active" />
  <date value="2019-11-01T09:29:23+11:00" />
  <description value="Performer" />
  <fhirVersion value="4.3.0" />
  <kind value="complex-type" />
  <abstract value="false" />
  <context>
    <type value="element" />
    <expression value="CarePlan" />
  </context>
  <type value="Extension" />
  <baseDefinition value="http://hl7.org/fhir/StructureDefinition/Extension" />
  <derivation value="constraint" />
  <differential>
    <element id="Extension">
      <path value="Extension" />
      <max value="1" />
      <isModifier value="false" />
    </element>
    <element id="Extension.id">
      <path value="Extension.id" />
      <max value="0" />
    </element>
    <element id="Extension.url">
      <path value="Extension.url" />
      <fixedUri value="http://ihis.sg/extension/performer" />
    </element>
    <element id="Extension.value[x]">
      <path value="Extension.value[x]" />
      <type>
        <code value="Identifier" />
      </type>
    </element>
    <element id="Extension.value[x].id">
      <path value="Extension.value[x].id" />
      <max value="0" />
    </element>
    <element id="Extension.value[x].use">
      <path value="Extension.value[x].use" />
      <max value="0" />
    </element>
    <element id="Extension.value[x].type">
      <path value="Extension.value[x].type" />
      <max value="0" />
    </element>
    <element id="Extension.value[x].system">
      <path value="Extension.value[x].system" />
      <min value="1" />
      <fixedUri value="http://ihis.sg/identifier/prs" />
    </element>
    <element id="Extension.value[x].value">
      <path value="Extension.value[x].value" />
      <min value="1" />
      <constraint>
        <key value="performer-value-validation" />
        <severity value="error" />
        <human value="Performer value should not be empty" />
        <expression value="$this.length() &gt; 0" />
      </constraint>
    </element>
    <element id="Extension.value[x].period">
      <path value="Extension.value[x].period" />
      <max value="0" />
    </element>
    <element id="Extension.value[x].assigner">
      <path value="Extension.value[x].assigner" />
      <max value="0" />
    </element>
  </differential>
</StructureDefinition>