<StructureDefinition xmlns="http://hl7.org/fhir">
  <url value="https://fhir.nhs.uk/StructureDefinition/NHSDigital-MessageDefinition" />
  <name value="NHSDigitalMessageDefinition" />
  <status value="draft" />
  <fhirVersion value="4.0.1" />
  <kind value="resource" />
  <abstract value="false" />
  <type value="MessageDefinition" />
  <baseDefinition value="http://hl7.org/fhir/StructureDefinition/MessageDefinition" />
  <derivation value="constraint" />
  <differential>
    <element id="MessageDefinition.url">
      <path value="MessageDefinition.url" />
      <min value="1" />
      <mustSupport value="true" />
    </element>
    <element id="MessageDefinition.description">
      <path value="MessageDefinition.description" />
      <min value="1" />
      <mustSupport value="true" />
    </element>
    <element id="MessageDefinition.useContext.code">
      <path value="MessageDefinition.useContext.code" />
      <binding>
        <strength value="required" />
        <valueSet value="https://fhir.nhs.uk/ValueSet/NHSDigital-usage-context-type" />
      </binding>
    </element>
    <element id="MessageDefinition.event[x]">
      <path value="MessageDefinition.event[x]" />
      <type>
        <code value="Coding" />
      </type>
      <mustSupport value="true" />
      <binding>
        <strength value="required" />
        <valueSet value="https://fhir.nhs.uk/ValueSet/NHSDigital-message-events" />
      </binding>
    </element>
    <element id="MessageDefinition.focus">
      <path value="MessageDefinition.focus" />
      <min value="1" />
      <mustSupport value="true" />
    </element>
  </differential>
</StructureDefinition>