<StructureDefinition xmlns="http://hl7.org/fhir">
  <id value="DhdCataractIolMaterialExtension" />
  <url value="http://dhd.nl/fhir/StructureDefinition/DhdCataractIolMaterialExtension" />
  <version value="0.1.0" />
  <name value="DhdCataractIolMaterialExtension" />
  <title value="DHD Cataract IOL material" />
  <status value="draft" />
  <description value="The material of the intraocular lens used during cataract treatment." />
  <fhirVersion value="3.0.2" />
  <kind value="complex-type" />
  <abstract value="false" />
  <contextType value="resource" />
  <context value="Device" />
  <type value="Extension" />
  <baseDefinition value="http://hl7.org/fhir/StructureDefinition/Extension" />
  <derivation value="constraint" />
  <snapshot />
  <differential>
    <element id="Extension.extension">
      <path value="Extension.extension" />
      <max value="0" />
    </element>
    <element id="Extension.url">
      <path value="Extension.url" />
      <fixedUri value="http://dhd.nl/fhir/StructureDefinition/DhdCataractIolMaterialExtension" />
    </element>
    <element id="Extension.value[x]:valueCodeableConcept">
      <path value="Extension.valueCodeableConcept" />
      <sliceName value="valueCodeableConcept" />
      <min value="1" />
      <type>
        <code value="CodeableConcept" />
      </type>
      <binding>
        <strength value="required" />
        <description value="IOL material from the existing Nictiz ProductTypeCodelijst." />
        <valueSetReference>
          <reference value="http://decor.nictiz.nl/fhir/ValueSet/2.16.840.1.113883.2.4.3.11.60.40.2.10.1.1--20171231000000" />
          <display value="ProductTypeCodelijst" />
        </valueSetReference>
      </binding>
    </element>
  </differential>
</StructureDefinition>