<DataElement xmlns="http://hl7.org/fhir">
  <id value="date.value" />
  <meta>
    <lastUpdated value="2017-04-19T07:44:43.294+10:00" />
  </meta>
  <url value="http://hl7.org/fhir/DataElement/date.value" />
  <status value="draft" />
  <experimental value="true" />
  <stringency value="fully-specified" />
  <element id="date.value">
    <path value="date.value" />
    <representation value="xmlAttr" />
    <short value="Primitive value for date" />
    <definition value="The actual value" />
    <min value="0" />
    <max value="1" />
    <type>
      <extension url="http://hl7.org/fhir/StructureDefinition/structuredefinition-regex">
        <valueString value="-?[0-9]{4}(-(0[1-9]|1[0-2])(-(0[0-9]|[1-2][0-9]|3[0-1]))?)?" />
      </extension>
      <code>
        <extension url="http://hl7.org/fhir/StructureDefinition/structuredefinition-json-type">
          <valueString value="string" />
        </extension>
        <extension url="http://hl7.org/fhir/StructureDefinition/structuredefinition-xml-type">
          <valueString value="xsd:gYear OR xsd:gYearMonth OR xsd:date" />
        </extension>
        <extension url="http://hl7.org/fhir/StructureDefinition/structuredefinition-rdf-type">
          <valueString value="xsd:gYear OR xsd:gYearMonth OR xsd:date" />
        </extension>
      </code>
    </type>
  </element>
</DataElement>