{description: 'Filter search parameter which supports a more sophisticated grammar for searching. See [documentation](search_filter.html) for further details', package_name: hl7.fhir.r4b.core, name: _filter, type: token, package_version: 4.3.0, class: unknown, kind: null, url: 'http://hl7.org/fhir/SearchParameter/Resource-filter', version: 4.3.0}