{"base":["Resource"],"code":"_filter","contact":[{"telecom":[{"system":"url","value":"http://www.hl7.org/Special/committees/fiwg"}]}],"date":"2018-07-26","description":"This is the formal declaration for the _filter parameter, documented at [http://hl7.org/fhir/search_filter.html](http://hl7.org/fhir/search_filter.html)","experimental":false,"extension":[{"url":"http://hl7.org/fhir/StructureDefinition/structuredefinition-wg","valueCode":"fhir"}],"id":"filter","name":"FilterSearchParameter","publisher":"HL7 International / FHIR Infrastructure","purpose":"Support combination searches when the simple name=value basis of search cannot express what is required","resourceType":"SearchParameter","status":"draft","title":"Filter Search Parameter","type":"special","url":"http://hl7.org/fhir/SearchParameter/filter","version":"1"}