<StructureDefinition xmlns="http://hl7.org/fhir">
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  <meta>
    <lastUpdated value="2017-10-20T17:45:08.939+01:00" />
  </meta>
  <url value="http://hl7.org/fhir/StructureDefinition/Category" />
  <name value="Category" />
  <status value="draft" />
  <date value="2017-10-20T17:33:35.725+01:00" />
  <fhirVersion value="3.0.1" />
  <kind value="primitive-type" />
  <abstract value="false" />
  <contextType value="resource" />
  <context value="Observation" />
  <type value="Extension" />
  <baseDefinition value="http://hl7.org/fhir/StructureDefinition/Extension" />
  <derivation value="constraint" />
  <differential>
    <element id="Extension">
      <path value="Extension" />
      <max value="1" />
    </element>
    <element id="Extension.id">
      <path value="Extension.id" />
      <definition value="unique id for the element within a resource (for internal references). This may be any string value that does not contain spaces." />
    </element>
    <element id="Extension.url">
      <path value="Extension.url" />
      <fixedUri value="http://hl7.org/fhir/StructureDefinition/Category" />
    </element>
  </differential>
</StructureDefinition>