Formal Definition for _filter parameter

@prefix fhir: <http://hl7.org/fhir/> .
@prefix owl: <http://www.w3.org/2002/07/owl#> .
@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
@prefix xsd: <http://www.w3.org/2001/XMLSchema#> .

# - resource -------------------------------------------------------------------

[a fhir:SearchParameter ;
  fhir:nodeRole fhir:treeRoot ;
  fhir:id [ fhir:v "filter"] ; # 
  fhir:extension ( [
     fhir:url [ fhir:v "http://hl7.org/fhir/StructureDefinition/structuredefinition-wg"^^xsd:anyURI ] ;
     fhir:value [ fhir:v "fhir" ]
  ] ) ; # 
  fhir:url [ fhir:v "http://hl7.org/fhir/SearchParameter/filter"^^xsd:anyURI] ; # 
  fhir:version [ fhir:v "1"] ; # 
  fhir:name [ fhir:v "FilterSearchParameter"] ; # 
  fhir:title [ fhir:v "Filter Search Parameter"] ; # 
  fhir:status [ fhir:v "draft"] ; # 
  fhir:experimental [ fhir:v "false"^^xsd:boolean] ; # 
  fhir:date [ fhir:v "2018-07-26"^^xsd:date] ; # 
  fhir:publisher [ fhir:v "HL7 International / FHIR Infrastructure"] ; # 
  fhir:contact ( [
     fhir:telecom ( [
       fhir:system [ fhir:v "url" ] ;
       fhir:value [ fhir:v "http://www.hl7.org/Special/committees/fiwg" ]
     ] )
  ] ) ; # 
  fhir:description [ fhir:v "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)"] ; # 
  fhir:purpose [ fhir:v "Support combination searches when the simple name=value basis of search cannot express what is required"] ; # 
  fhir:code [ fhir:v "_filter"] ; # 
  fhir:base ( [ fhir:v "Resource"] ) ; # 
  fhir:type [ fhir:v "special"]] . # 

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