<Patient xmlns="http://hl7.org/fhir">
  <id value="Jane" />
  <meta>
    <profile value="http://example.org/StructureDefinition/Cowboy" />
  </meta>
  <extension url="http://example.org/StructureDefinition/FavouriteCowboyHat">
    <valueCoding>
      <system value="http://example.org/CodeSystem/CowboyHatTypes" />
      <code value="gus" />
    </valueCoding>
  </extension>
  <name>
    <family value="Doe" />
    <given value="Jane" />
  </name>
</Patient>