<StructureDefinition xmlns="http://hl7.org/fhir">
  <url value="https://nely.example.org/StructureDefinition/preferredLanguage" />
  <name value="preferredWritten" />
  <status value="draft" />
  <date value="2018-03-14T12:57:52.277+01:00" />
  <description value="A preference for written or spoken language can be added" />
  <fhirVersion value="3.0.1" />
  <kind value="complex-type" />
  <abstract value="false" />
  <contextType value="resource" />
  <context value="Patient.communication.preferred" />
  <type value="Extension" />
  <baseDefinition value="http://hl7.org/fhir/StructureDefinition/Extension" />
  <derivation value="constraint" />
  <differential>
    <element id="Extension.url">
      <path value="Extension.url" />
      <fixedUri value="https://nely.example.org/StructureDefinition/preferredLanguage" />
    </element>
    <element id="Extension.value[x]:valueString">
      <path value="Extension.valueString" />
      <sliceName value="valueString" />
      <min value="1" />
      <type>
        <code value="string" />
      </type>
      <defaultValueString value="written" />
      <example>
        <label value="preferredLanguage" />
        <valueString value="written" />
      </example>
      <example>
        <label value="preferredLanguage" />
        <valueString value="spoken" />
      </example>
    </element>
  </differential>
</StructureDefinition>