<SearchParameter xmlns="http://hl7.org/fhir">
  <id value="MessageDefinition-identifier" />
  <url value="http://hl7.org/fhir/SearchParameter/MessageDefinition-identifier" />
  <name value="identifier" />
  <status value="draft" />
  <experimental value="false" />
  <date value="2017-04-19T07:44:43+10:00" />
  <publisher value="Health Level Seven International (Infrastructure And Messaging)" />
  <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/inm/index.cfm" />
    </telecom>
  </contact>
  <code value="identifier" />
  <base value="MessageDefinition" />
  <type value="token" />
  <description value="External identifier for the message definition" />
  <expression value="MessageDefinition.identifier" />
  <xpath value="f:MessageDefinition/f:identifier" />
  <xpathUsage value="normal" />
</SearchParameter>