<StructureDefinition xmlns="http://hl7.org/fhir">
  <id value="ext-CodeSpecification" />
  <text>
    <status value="empty" />
    <div xmlns="http://www.w3.org/1999/xhtml">No narrative is provided for definitional resources. A human-readable rendering can be found in the implementation guide(s) where this resource is used.</div>
  </text>
  <url value="http://nictiz.nl/fhir/StructureDefinition/ext-CodeSpecification" />
  <name value="ExtCodeSpecification" />
  <title value="ext CodeSpecification" />
  <status value="draft" />
  <publisher value="Nictiz" />
  <contact>
    <name value="Nictiz" />
    <telecom>
      <system value="url" />
      <value value="https://www.nictiz.nl" />
      <use value="work" />
    </telecom>
  </contact>
  <description value="Sometimes it is not possible to use the ValueSet from the functional description on the corresponding FHIR element. This is a common occurrence when the FHIR element has datatype _code_ and has a _required_ binding with an incompatible FHIR core ValueSet. It can also happen when the FHIR element has a _string_ or other non-coded datatype.&#xD;&#xA;&#xD;&#xA;In this case, the FHIR element may be augmented with this extension to communicate the code from the functional description. This information should always be _added_ to the normal use of the FHIR element to allow for maximum interoperability." />
  <copyright value="Copyright and related rights waived via CC0, https://creativecommons.org/publicdomain/zero/1.0/. This does not apply to information from third parties, for example a medical terminology system. The implementer alone is responsible for identifying and obtaining any necessary licenses or authorizations to utilize third party IP in connection with the specification or otherwise." />
  <fhirVersion value="4.0.1" />
  <kind value="complex-type" />
  <abstract value="false" />
  <context>
    <type value="element" />
    <expression value="code" />
  </context>
  <context>
    <type value="element" />
    <expression value="Coding" />
  </context>
  <context>
    <type value="element" />
    <expression value="string" />
  </context>
  <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="http://nictiz.nl/fhir/StructureDefinition/ext-CodeSpecification" />
    </element>
    <element id="Extension.value[x]">
      <path value="Extension.value[x]" />
      <type>
        <code value="CodeableConcept" />
      </type>
    </element>
  </differential>
</StructureDefinition>