<?xml version="1.0" encoding="UTF-8"?><SearchParameter xmlns="http://hl7.org/fhir">
  <id value="filter"/>
  <meta>
    <security>
      <system value="http://terminology.hl7.org/CodeSystem/v3-ActReason"/>
      <code value="HTEST"/>
      <display value="test health data"/>
    </security>
  </meta>
  <extension url="http://hl7.org/fhir/StructureDefinition/structuredefinition-wg">
    <valueCode value="fhir"/>
  </extension>
  <url value="http://hl7.org/fhir/SearchParameter/filter"/>
  <version value="1"/>
  <name value="FilterSearchParameter"/>
  <title value="Filter Search Parameter"/>
  <status value="draft"/>
  <experimental value="false"/>
  <date value="2018-07-26"/>
  <publisher value="HL7 International / FHIR Infrastructure"/>
  <contact>
    <telecom>
      <system value="url"/>
      <value value="http://www.hl7.org/Special/committees/fiwg"/>
    </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>