<StructureDefinition xmlns="http://hl7.org/fhir">
  <url value="https://sil-th-group-a.org/fhir/StructureDefinition/CancerPatient" />
  <name value="CancerPatient" />
  <status value="draft" />
  <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.identifier">
      <path value="Patient.identifier" />
      <min value="1" />
      <mustSupport value="true" />
    </element>
    <element id="Patient.name">
      <path value="Patient.name" />
      <min value="1" />
      <constraint>
        <key value="name-required" />
        <severity value="error" />
        <human value="Either a given name MUST be provided or a family name MUST include" />
        <expression value="family.exists() or given.exists()" />
      </constraint>
    </element>
    <element id="Patient.name.family">
      <path value="Patient.name.family" />
      <mustSupport value="true" />
    </element>
    <element id="Patient.name.given">
      <path value="Patient.name.given" />
      <mustSupport value="true" />
    </element>
    <element id="Patient.telecom">
      <path value="Patient.telecom" />
      <slicing>
        <discriminator>
          <type value="value" />
          <path value="system" />
        </discriminator>
        <discriminator>
          <type value="value" />
          <path value="use" />
        </discriminator>
        <rules value="open" />
      </slicing>
      <min value="1" />
    </element>
    <element id="Patient.telecom:phone">
      <path value="Patient.telecom" />
      <sliceName value="phone" />
    </element>
    <element id="Patient.telecom:phone.system">
      <path value="Patient.telecom.system" />
      <min value="1" />
      <fixedCode value="phone" />
    </element>
    <element id="Patient.telecom:phone.use">
      <path value="Patient.telecom.use" />
      <min value="1" />
      <fixedCode value="mobile" />
    </element>
    <element id="Patient.telecom:email">
      <path value="Patient.telecom" />
      <sliceName value="email" />
    </element>
    <element id="Patient.telecom:email.system">
      <path value="Patient.telecom.system" />
      <min value="1" />
      <fixedCode value="email" />
    </element>
    <element id="Patient.gender">
      <path value="Patient.gender" />
      <mustSupport value="true" />
    </element>
    <element id="Patient.deceased[x]">
      <path value="Patient.deceased[x]" />
      <mustSupport value="true" />
    </element>
  </differential>
</StructureDefinition>