<status value="draft"/><experimental value="true"/><publisher value="HL7 International / FHIR Infrastructure"/><contact><telecom><system value="url"/><value value="http://www.hl7.org/Special/committees/fiwg"/></telecom></contact><description value="Search by url for a participation agreement, which is stored as an extension referencing a DocumentReference"/><code value="part-agree"/><base value="Patient"/><type value="reference"/><expression value="Patient.extension('http://example.org/fhir/StructureDefinition/participation-agreement').value"/><processingMode value="normal"/><target value="DocumentReference"/></SearchParameter>