<StructureDefinition xmlns="http://hl7.org/fhir">
  <url value="https://example.org/fhir/StructureDefinition/PH_Period" />
  <name value="PH_Period" />
  <status value="draft" />
  <fhirVersion value="4.0.1" />
  <kind value="complex-type" />
  <abstract value="false" />
  <type value="Period" />
  <baseDefinition value="http://hl7.org/fhir/StructureDefinition/Period" />
  <derivation value="constraint" />
</StructureDefinition>