{

"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"

}