<StructureDefinition xmlns="http://hl7.org/fhir">
  <id value="NHSDigital-NHSDigitalMedicationStatement" />
  <url value="https://fhir.nhs.uk/StructureDefinition/NHSDigital-MedicationStatement" />
  <name value="NHSDigitalMedicationStatement" />
  <status value="draft" />
  <fhirVersion value="4.0.1" />
  <kind value="resource" />
  <abstract value="false" />
  <type value="MedicationStatement" />
  <baseDefinition value="https://fhir.hl7.org.uk/StructureDefinition/UKCore-MedicationStatement" />
  <derivation value="constraint" />
  <differential>
    <element id="MedicationStatement.basedOn">
      <path value="MedicationStatement.basedOn" />
      <type>
        <code value="Reference" />
        <targetProfile value="https://fhir.hl7.org.uk/StructureDefinition/UKCore-CarePlan" />
        <targetProfile value="https://fhir.nhs.uk/StructureDefinition/NHSDigital-MedicationRequest" />
        <targetProfile value="https://fhir.nhs.uk/StructureDefinition/NHSDigital-ServiceRequest" />
        <aggregation value="referenced" />
      </type>
    </element>
    <element id="MedicationStatement.medication[x]">
      <path value="MedicationStatement.medication[x]" />
      <type>
        <code value="CodeableConcept" />
        <profile value="https://fhir.nhs.uk/StructureDefinition/NHSDigital-MedicationRequest-CodeableConcept" />
      </type>
      <type>
        <code value="Reference" />
        <targetProfile value="https://fhir.nhs.uk/StructureDefinition/NHSDigital-MedicationRequest-Medication" />
        <aggregation value="referenced" />
      </type>
    </element>
    <element id="MedicationStatement.subject">
      <path value="MedicationStatement.subject" />
      <type>
        <code value="Reference" />
        <targetProfile value="https://fhir.nhs.uk/StructureDefinition/NHSDigital-Patient" />
        <aggregation value="referenced" />
      </type>
      <constraint>
        <key value="nhsd-subject" />
        <severity value="error" />
        <human value="focus - An identifier reference or resource reference must be provided" />
        <expression value="(reference.exists() or identifier.exists())" />
        <source value="https://fhir.nhs.uk/StructureDefinition/NHSDigital-MedicationStatement" />
      </constraint>
    </element>
    <element id="MedicationStatement.subject.identifier">
      <path value="MedicationStatement.subject.identifier" />
      <min value="1" />
    </element>
    <element id="MedicationStatement.subject.identifier.system">
      <path value="MedicationStatement.subject.identifier.system" />
      <min value="1" />
      <fixedUri value="https://fhir.nhs.uk/Id/nhs-number" />
    </element>
    <element id="MedicationStatement.subject.identifier.value">
      <path value="MedicationStatement.subject.identifier.value" />
      <min value="1" />
    </element>
    <element id="MedicationStatement.informationSource">
      <path value="MedicationStatement.informationSource" />
      <type>
        <code value="Reference" />
        <aggregation value="referenced" />
      </type>
    </element>
  </differential>
</StructureDefinition>