<status value="active" /> <experimental value="false" /> <description value="A reference to a Patient that may need to occasionally point to a Group" /> <fhirVersion value="5.0.0" /> <mapping> <identity value="BPCS" /> <name value="Internal BPCS API" /> </mapping> <kind value="complex-type" /> <abstract value="false" /> <type value="Reference" /> <baseDefinition value="http://hl7.org/fhir/StructureDefinition/Reference" /> <derivation value="constraint" /> <differential> <element id="Reference"> <path value="Reference" /> <constraint> <key value="bpcs-reference-1" /> <severity value="error" /> <human value="Must have either a reference or a subject extension, but not both" /> <expression value="reference.exists() != extension('https://bpcs.exchange/fhir/StructureDefinition/ext-Resource-Subject').exists()" /> </constraint> <constraint> <key value="bpcs-reference-2" /> <severity value="error" /> <human value="If reference is not present, must have display" /> <expression value="reference.exists().not() implies display.exists()" /> </constraint> </element> <element id="Reference.extension:family"> <path value="Reference.extension" /> <sliceName value="family" /> <type> <code value="Extension" /> <profile value="https://bpcs.exchange/fhir/StructureDefinition/ext-Resource-Subject" /> </type> <condition value="bpcs-reference-1" /> <mustSupport value="true" /> <mapping> <identity value="BPCS" /> <map value="BatchRecordDTO.applicationNum (in Group reference), BatchInfoDTO.applicationNum (in Group reference)" /> </mapping> </element> <element id="Reference.reference"> <path value="Reference.reference" /> <condition value="bpcs-reference-1" /> <mustSupport value="true" /> <mapping> <identity value="BPCS" /> <map value="ReceiptDTO.odbNum, BatchRecordDTO.odbNum, BatchInfoDTO.odbNum" /> </mapping> </element> <element id="Reference.display"> <path value="Reference.display" /> <comment value="If there is no reference (because there's an extension), this conveys the id of the group being referenced to satisfy best-practice" /> <condition value="bpcs-reference-2" /> <mustSupport value="true" /> </element> </differential> </StructureDefinition>