<StructureDefinition xmlns="http://hl7.org/fhir">
  <url value="http://ontariohealth.ca/fhir/StructureDefinition/ca-on-mha-ext-ServiceRequestReceivedDate" />
  <version value="1.0.0" />
  <name value="ServiceRequestReceivedDate" />
  <status value="active" />
  <fhirVersion value="4.0.1" />
  <kind value="complex-type" />
  <abstract value="false" />
  <context>
    <type value="element" />
    <expression value="ServiceRequest" />
  </context>
  <type value="Extension" />
  <baseDefinition value="http://hl7.org/fhir/StructureDefinition/Extension" />
  <derivation value="constraint" />
  <differential>
    <element id="Extension.url">
      <path value="Extension.url" />
      <fixedUri value="http://ontariohealth.ca/fhir/StructureDefinition/ca-on-mha-ext-ServiceRequestReceivedDate" />
    </element>
    <element id="Extension.value[x]">
      <path value="Extension.value[x]" />
      <min value="1" />
      <type>
        <code value="date" />
      </type>
      <constraint>
        <key value="referralReceivedDate-inv-1" />
        <severity value="error" />
        <human value="Referral Received Date must be a full date (YYYY-MM-DD)" />
        <expression value="$this.toString().matches('^[0-9]{4}-(0[1-9]|1[0-2])-(0[1-9]|[12][0-9]|3[01])$')" />
      </constraint>
      <mustSupport value="true" />
    </element>
  </differential>
</StructureDefinition>