Search parameter for an extension example (id = "example-extension")

<?xml version="1.0" encoding="UTF-8"?>

<SearchParameter xmlns="http://hl7.org/fhir">
  <id value="example-extension"/> 
  <text> <status value="extensions"/> <div xmlns="http://www.w3.org/1999/xhtml"><p> <b> Generated Narrative: SearchParameter</b> <a name="example-extension"> </a> </p> <div style="display: inline-block; background-color: #d9e0e7; padding: 6px; margin: 4px; border:
       1px solid #8da1b4; border-radius: 5px; line-height: 60%"><p style="margin-bottom: 0px">Resource SearchParameter &quot;example-extension&quot; </p> </div> <p> <b> StructureDefinition Work Group</b> : fhir</p> <p> <b> url</b> : <code> http://hl7.org/fhir/SearchParameter/example-extension</code> </p> <p> <b> name</b> : ExampleSearchParameterOnAnExtension</p> <p> <b> title</b> : Example Search Parameter on an extension</p> <p> <b> status</b> : draft</p> <p> <b> experimental</b> : true</p> <p> <b> publisher</b> : HL7 International / FHIR Infrastructure</p> <p> <b> contact</b> : <a href="http://www.hl7.org/Special/committees/fiwg">http://www.hl7.org/Special/committees/fiwg</a> </p> <p> <b> description</b> : Search by url for a participation agreement, which is stored as an extension
         referencing a DocumentReference</p> <p> <b> code</b> : part-agree</p> <p> <b> base</b> : Patient</p> <p> <b> type</b> : reference</p> <p> <b> expression</b> : Patient.extension('http://example.org/fhir/StructureDefinition/participation-agreement').va
        lue</p> <p> <b> processingMode</b> : normal</p> <p> <b> target</b> : DocumentReference</p> </div> </text> <extension url="http://hl7.org/fhir/StructureDefinition/structuredefinition-wg"><valueCode value="fhir"/> </extension> 
  <url value="http://hl7.org/fhir/SearchParameter/example-extension"/> 
  <name value="ExampleSearchParameterOnAnExtension"/> 
  <title value="Example Search Parameter on an extension"/> 
  <status value="draft"/> 
  <experimental value="true"/> 
  <publisher value="HL7 International / FHIR Infrastructure"/> 
  <contact> 
    <telecom> 
      <system value="url"/> 
      <value value="http://www.hl7.org/Special/committees/fiwg"/> 
    </telecom> 
  </contact> 
  <description value="Search by url for a participation agreement, which is stored as an extension referencing
   a DocumentReference"/> 
  <code value="part-agree"/> 
  <base value="Patient"/> 
  <type value="reference"/> 
  <expression value="Patient.extension('http://example.org/fhir/StructureDefinition/participation-agreement').valu
  e"/> 
  <processingMode value="normal"/> 
  <target value="DocumentReference"/> 
</SearchParameter>