<StructureDefinition xmlns="http://hl7.org/fhir">
  <url value="https://fhir.nhs.uk/StructureDefinition/Extension-EPS-Prescription" />
  <name value="ExtensionEPSPrescription" />
  <status value="draft" />
  <fhirVersion value="4.0.1" />
  <kind value="complex-type" />
  <abstract value="false" />
  <context>
    <type value="element" />
    <expression value="Task" />
  </context>
  <type value="Extension" />
  <baseDefinition value="http://hl7.org/fhir/StructureDefinition/Extension" />
  <derivation value="constraint" />
  <differential>
    <element id="Extension.extension">
      <path value="Extension.extension" />
      <slicing>
        <discriminator>
          <type value="value" />
          <path value="url" />
        </discriminator>
        <rules value="open" />
      </slicing>
    </element>
    <element id="Extension.extension:courseOfTherapyType">
      <path value="Extension.extension" />
      <sliceName value="courseOfTherapyType" />
      <max value="1" />
    </element>
    <element id="Extension.extension:courseOfTherapyType.url">
      <path value="Extension.extension.url" />
      <fixedUri value="courseOfTherapyType" />
    </element>
    <element id="Extension.extension:courseOfTherapyType.value[x]">
      <path value="Extension.extension.value[x]" />
      <type>
        <code value="Coding" />
      </type>
      <binding>
        <strength value="required" />
        <valueSet value="https://fhir.nhs.uk/ValueSet/DM-medicationrequest-course-of-therapy" />
      </binding>
    </element>
    <element id="Extension.url">
      <path value="Extension.url" />
      <fixedUri value="https://fhir.nhs.uk/StructureDefinition/Extension-EPS-Prescription" />
    </element>
    <element id="Extension.value[x]">
      <path value="Extension.value[x]" />
      <max value="0" />
    </element>
  </differential>
</StructureDefinition>