<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