{"resourceType":"SearchParameter","id":"filter","url":"http://hl7.org/fhir/SearchParameter/filter","version":"1","name":"FilterSearchParameter","status":"draft","experimental":false,"date":"2018-07-26","publisher":"Health Level Seven International (FHIR Infrastructure)","contact":[{"name":"FHIR Project","telecom":[{"system":"url","value":"http://hl7.org/fhir"}]}],"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)","purpose":"Support combination searches when the simple name=value basis of search cannot express what is required","code":"_filter","base":["Resource"],"type":"special"}