<SearchParameter xmlns="http://hl7.org/fhir">
  <id value="ValueSet-reference" />
  <url value="http://hl7.org/fhir/SearchParameter/ValueSet-reference" />
  <name value="reference" />
  <status value="draft" />
  <experimental value="false" />
  <publisher value="Health Level Seven International (Vocabulary)" />
  <contact>
    <telecom>
      <system value="url" />
      <value value="http://hl7.org/fhir" />
    </telecom>
  </contact>
  <contact>
    <telecom>
      <system value="url" />
      <value value="http://www.hl7.org/Special/committees/Vocab/index.cfm" />
    </telecom>
  </contact>
  <code value="reference" />
  <base value="ValueSet" />
  <type value="uri" />
  <description value="A code system included or excluded in the value set or an imported value set" />
  <expression value="ValueSet.compose.include.system" />
  <xpath value="f:ValueSet/f:compose/f:include/f:system" />
  <xpathUsage value="normal" />
</SearchParameter>