<StructureDefinition xmlns="http://hl7.org/fhir">
  <id value="valueset-system" />
  <extension url="http://hl7.org/fhir/StructureDefinition/structuredefinition-wg">
    <valueCode value="vocab" />
  </extension>
  <extension url="http://hl7.org/fhir/StructureDefinition/structuredefinition-fmm">
    <valueInteger value="1" />
  </extension>
  <url value="http://hl7.org/fhir/StructureDefinition/valueset-system" />
  <name value="system" />
  <status value="draft" />
  <date value="2017-04-19T07:44:43+10:00" />
  <publisher value="HL7" />
  <description value="Allows a direct reference to the code system for FHIR query." />
  <fhirVersion value="3.0.1" />
  <mapping>
    <identity value="rim" />
    <uri value="http://hl7.org/v3" />
    <name value="RIM Mapping" />
  </mapping>
  <kind value="complex-type" />
  <abstract value="false" />
  <contextType value="resource" />
  <context value="ValueSet.compose.include.system" />
  <type value="Extension" />
  <baseDefinition value="http://hl7.org/fhir/StructureDefinition/Extension" />
  <derivation value="constraint" />
  <differential>
    <element id="Extension">
      <path value="Extension" />
      <short value="Code system resource" />
      <definition value="Allows a direct reference to the code system for FHIR query." />
      <min value="0" />
      <max value="1" />
      <isModifier value="false" />
    </element>
    <element id="Extension.extension">
      <path value="Extension.extension" />
      <max value="0" />
    </element>
    <element id="Extension.url">
      <path value="Extension.url" />
      <type>
        <code value="uri" />
      </type>
      <fixedUri value="http://hl7.org/fhir/StructureDefinition/valueset-system" />
    </element>
    <element id="Extension.valueReference">
      <path value="Extension.valueReference" />
      <type>
        <code value="Reference" />
        <targetProfile value="http://hl7.org/fhir/StructureDefinition/CodeSystem" />
      </type>
    </element>
  </differential>
</StructureDefinition>