<StructureDefinition xmlns="http://hl7.org/fhir">
  <url value="https://Ex2.org/fhir/StructureDefinition/Ex2Patient" />
  <name value="Ex2Patient" />
  <status value="draft" />
  <description value="Patient profile for Exercise 2" />
  <fhirVersion value="4.0.1" />
  <kind value="resource" />
  <abstract value="false" />
  <type value="Patient" />
  <baseDefinition value="http://hl7.org/fhir/StructureDefinition/Patient" />
  <derivation value="constraint" />
  <differential>
    <element id="Patient">
      <path value="Patient" />
      <definition value="Patient profile for Exercise 2" />
    </element>
    <element id="Patient.identifier">
      <path value="Patient.identifier" />
      <slicing>
        <discriminator>
          <type value="value" />
          <path value="system" />
        </discriminator>
        <rules value="open" />
      </slicing>
      <min value="1" />
      <max value="1" />
      <mustSupport value="true" />
    </element>
    <element id="Patient.identifier:NHSNumber">
      <path value="Patient.identifier" />
      <sliceName value="NHSNumber" />
      <max value="1" />
    </element>
    <element id="Patient.identifier:NHSNumber.system">
      <path value="Patient.identifier.system" />
      <min value="1" />
      <fixedUri value="https://fhir.nhs.uk/Id/nhs-number" />
    </element>
    <element id="Patient.identifier:NHSNumber.value">
      <path value="Patient.identifier.value" />
      <min value="1" />
    </element>
    <element id="Patient.identifier:BCU_CRN">
      <path value="Patient.identifier" />
      <sliceName value="BCU_CRN" />
      <min value="1" />
      <max value="1" />
    </element>
    <element id="Patient.identifier:BCU_CRN.system">
      <path value="Patient.identifier.system" />
      <min value="1" />
      <fixedUri value="https://fhir.bcuhb.nhs.wales/Id/central-pas-identifier" />
    </element>
    <element id="Patient.identifier:BCU_CRN.value">
      <path value="Patient.identifier.value" />
      <min value="1" />
    </element>
    <element id="Patient.name">
      <path value="Patient.name" />
      <min value="1" />
      <type>
        <code value="HumanName" />
        <profile value="https://Ex4.org/fhir/StructureDefinition/ExHumanName" />
      </type>
      <mustSupport value="true" />
    </element>
    <element id="Patient.gender">
      <path value="Patient.gender" />
      <mustSupport value="true" />
    </element>
    <element id="Patient.birthDate">
      <path value="Patient.birthDate" />
      <min value="1" />
      <mustSupport value="true" />
    </element>
    <element id="Patient.address">
      <path value="Patient.address" />
      <constraint>
        <key value="GarethsAddressConstraint" />
        <severity value="error" />
        <human value="Must be completed" />
        <expression value="(use = 'temp') implies period.exists()" />
      </constraint>
    </element>
    <element id="Patient.address.use">
      <path value="Patient.address.use" />
      <condition value="GarethsAddressConstraint" />
    </element>
    <element id="Patient.address.period">
      <path value="Patient.address.period" />
      <condition value="GarethsAddressConstraint" />
    </element>
  </differential>
</StructureDefinition>