<status value="draft" /> <date value="2021-02-22T12:36:19.0214656Z" /> <description value="Extension to exchange only the patient's birthdate" /> <fhirVersion value="4.3.0" /> <kind value="complex-type" /> <abstract value="false" /> <context> <type value="element" /> <expression value="Subscription" /> </context> <type value="Extension" /> <baseDefinition value="http://hl7.org/fhir/StructureDefinition/Extension" /> <derivation value="constraint" /> <differential> <element id="Extension"> <path value="Extension" /> <short value="Patient date of birth" /> <definition value="Separate extension to pass on the date of birth" /> </element> <element id="Extension.extension"> <path value="Extension.extension" /> <max value="0" /> </element> <element id="Extension.url"> <path value="Extension.url" /> <fixedUri value="http://fhir.nl/StructureDefinition/Patient.birthDate" /> </element> <element id="Extension.value[x]"> <path value="Extension.value[x]" /> <type> <code value="date" /> </type> </element> </differential> </StructureDefinition>