<StructureDefinition xmlns="http://hl7.org/fhir">
  <url value="https://example.org/fhir/StructureDefinition/MyPatient" />
  <name value="MyPatient" />
  <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.system">
      <path value="Patient.identifier.system" />
      <code>
        <system value="http://snomed.info/sct" />
      </code>
    </element>
    <element id="Patient.address">
      <path value="Patient.address" />
      <mustSupport value="true" />
    </element>
  </differential>
</StructureDefinition>