<status value="active"/> <experimental value="false"/> <date value="2014-03-26"/> <description value="A group of entries within a composition that are related to a common clinical theme - such as a specific disorder or problem, prevention, screening and provision of contraceptive services. A topic may contain categories and entries."/> <immutable value="true"/> <compose> <include> <system value="http://terminology.hl7.org/CodeSystem/v3-ActClass"/> <filter> <property value="concept"/> <op value="is-a"/> <value value="TOPIC"/> </filter> </include> </compose> </ValueSet>