<StructureDefinition xmlns="http://hl7.org/fhir">
  <url value="https://example.org/fhir/StructureDefinition/MyPatient99" />
  <name value="MyPatient99" />
  <status value="draft" />
  <fhirVersion value="4.0.1" />
  <kind value="resource" />
  <abstract value="false" />
  <type value="Patient" />
  <baseDefinition value="http://hl7.org/fhir/StructureDefinition/Patient" />
  <derivation value="constraint" />
  <differential>
    <element id="Patient.gender.extension:testGenderExtension">
      <path value="Patient.gender.extension" />
      <sliceName value="testGenderExtension" />
      <type>
        <code value="Extension" />
        <profile value="https://example.org/fhir/StructureDefinition/TestGenderExtension" />
      </type>
      <isModifier value="false" />
    </element>
  </differential>
</StructureDefinition>