<status value="active" /> <experimental value="false" /> <description value="Data Absent Reason" /> <compose> <include> <system value="http://terminology.hl7.org/CodeSystem/data-absent-reason" /> <concept> <code value="not-applicable" /> <display value="Not Applicable" /> </concept> <concept> <code value="unknown" /> <display value="Unknown" /> </concept> </include> </compose> </ValueSet>