<StructureDefinition xmlns="http://hl7.org/fhir">
  <id value="spark1623" />
  <meta>
    <versionId value="spark1966" />
    <lastUpdated value="2015-11-17T17:25:15.416+00:00" />
  </meta>
  <url value="http://example.org/fhir/StructureDefinition/referral" />
  <name value="Referral extension" />
  <status value="draft" />
  <date value="2015-09-22T20:02:49+10:00" />
  <description value="A complex extension to represent a referral" />
  <fhirVersion value="1.0.1" />
  <kind value="datatype" />
  <constrainedType value="Extension" />
  <abstract value="false" />
  <contextType value="resource" />
  <context value="Basic" />
  <base value="http://hl7.org/fhir/StructureDefinition/Extension" />
  <differential>
    <element>
      <path value="Extension" />
      <min value="1" />
      <max value="1" />
    </element>
    <element>
      <path value="Extension.extension" />
      <name value="requestor" />
    </element>
    <element>
      <path value="Extension.extension.url" />
      <fixedUri value="requestor" />
    </element>
    <element>
      <path value="Extension.extension.value[x]" />
      <min value="1" />
      <max value="1" />
      <type>
        <code value="Reference" />
        <profile value="http://hl7.org/fhir/StructureDefinition/Practitioner" />
      </type>
    </element>
    <element>
      <path value="Extension.extension" />
      <name value="service" />
    </element>
    <element>
      <path value="Extension.extension.url" />
      <fixedUri value="service" />
    </element>
    <element>
      <path value="Extension.extension.value[x]" />
      <min value="1" />
      <max value="1" />
      <type>
        <code value="CodeableConcept" />
      </type>
      <binding>
        <strength value="preferred" />
        <valueSetReference>
          <reference value="http://hl7.org/fhir/ValueSet/all-of-snomed" />
        </valueSetReference>
      </binding>
    </element>
    <element>
      <path value="Extension.url" />
      <fixedUri value="http://example.org/fhir/StructureDefinition/referral" />
    </element>
    <element>
      <path value="Extension.value[x]" />
      <min value="0" />
      <max value="0" />
    </element>
  </differential>
</StructureDefinition>