<status value="draft"/> <experimental value="false"/> <date value="2018-07-26"/> <publisher value="Health Level Seven International (FHIR Infrastructure)"/> <contact> <name value="FHIR Project"/> <telecom> <system value="url"/> <value value="http://hl7.org/fhir"/> </telecom> </contact> <description value="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 value="Support combination searches when the simple name=value basis of search cannot express what is required"/> <code value="_filter"/> <base value="Resource"/> <type value="special"/> </SearchParameter>

Generated Narrative: SearchParameter

Resource SearchParameter "filter"

url: http://hl7.org/fhir/SearchParameter/filter

version: 1

name: FilterSearchParameter

title: Filter Search Parameter

status: draft

experimental: false

date: 2018-07-26

publisher: Health Level Seven International (FHIR Infrastructure)

contact: FHIR Project: 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