<SearchParameter xmlns="http://hl7.org/fhir">
  <id value="SearchDomain" />
  <url value="http://hl7.org/fhir/StructureDefinition/Terminology-Domain" />
  <name value="SearchDomain" />
  <status value="active" />
  <description value="SearchDomain" />
  <code value="Domain" />
  <base value="ValueSet" />
  <base value="CodeSystem" />
  <base value="ConceptMap" />
  <type value="reference" />
  <expression value="extension.Domain" />
</SearchParameter>