<StructureDefinition xmlns="http://hl7.org/fhir">
  <id value="observation-geneticsGene" />
  <extension url="http://hl7.org/fhir/StructureDefinition/structuredefinition-wg">
    <valueCode value="oo" />
  </extension>
  <extension url="http://hl7.org/fhir/StructureDefinition/structuredefinition-fmm">
    <valueInteger value="1" />
  </extension>
  <url value="http://hl7.org/fhir/StructureDefinition/observation-geneticsGene" />
  <name value="Gene" />
  <status value="draft" />
  <date value="2016-03-14" />
  <publisher value="Health Level Seven International (Clinical Genomics)" />
  <contact>
    <telecom>
      <system value="url" />
      <value value="http://www.hl7.org/Special/committees/clingenomics" />
    </telecom>
  </contact>
  <description value="A region (or regions) that includes all of the sequence elements necessary to encode a functional transcript. A gene may include regulatory regions, transcribed regions and/or other functional sequence regions ([SO:0000704](http://www.sequenceontology.org/browser/current_svn/term/SO:0000704)). This element is the official gene symbol approved by the HGNC, which is a short abbreviated form of the gene name ([HGNC](http://www.genenames.org)). LOINC Code: ([48018-6](http://loinc.org/48018-6))." />
  <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="Observation" />
  <type value="Extension" />
  <baseDefinition value="http://hl7.org/fhir/StructureDefinition/Extension" />
  <derivation value="constraint" />
  <differential>
    <element id="Extension">
      <path value="Extension" />
      <short value="HGNC gene symbol" />
      <definition value="A region (or regions) that includes all of the sequence elements necessary to encode a functional transcript. A gene may include regulatory regions, transcribed regions and/or other functional sequence regions ([SO:0000704](http://www.sequenceontology.org/browser/current_svn/term/SO:0000704)). This element is the official gene symbol approved by the HGNC, which is a short abbreviated form of the gene name ([HGNC](http://www.genenames.org)). LOINC Code: ([48018-6](http://loinc.org/48018-6))." />
      <comment value="Other systems or genes not defined in HGNC (e.g., BCR-ABL fusion gene) can be added by using a local extension." />
      <min value="0" />
      <max value="1" />
    </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/observation-geneticsGene" />
    </element>
    <element id="Extension.valueCodeableConcept">
      <path value="Extension.valueCodeableConcept" />
      <type>
        <code value="CodeableConcept" />
      </type>
      <binding>
        <extension url="http://hl7.org/fhir/StructureDefinition/elementdefinition-bindingName">
          <valueString value="HGNC-geneIdentifiers" />
        </extension>
        <strength value="preferred" />
        <description value="International curated set of gene identifiers" />
        <valueSetUri value="http://www.genenames.org" />
      </binding>
    </element>
  </differential>
</StructureDefinition>