{"base":["Patient"],"code":"part-agree","contact":[{"telecom":[{"system":"url","value":"http://www.hl7.org/Special/committees/fiwg"}]}],"description":"Search by url for a participation agreement, which is stored as an extension referencing a DocumentReference","experimental":true,"expression":"Patient.extension('http://example.org/fhir/StructureDefinition/participation-agreement').value","extension":[{"url":"http://hl7.org/fhir/StructureDefinition/structuredefinition-wg","valueCode":"fhir"}],"id":"example-extension","name":"ExampleSearchParameterOnAnExtension","processingMode":"normal","publisher":"HL7 International / FHIR Infrastructure","resourceType":"SearchParameter","status":"draft","target":["DocumentReference"],"title":"Example Search Parameter on an extension","type":"reference","url":"http://hl7.org/fhir/SearchParameter/example-extension"}