<status value="active"/> <date value="2014-03-26"/> <description value="Provides codes for decision methods, initially for assessing the causality of events."/> <compose> <include> <system value="http://terminology.hl7.org/CodeSystem/v3-ObservationMethod"/> <filter> <property value="concept"/> <op value="descendent-of"/> <value value="_DecisionObservationMethod"/> </filter> </include> </compose> </ValueSet>