<status value="active"/> <date value="2014-03-26"/> <description value="The generalization relationship can be used to express categorical knowledge about services (e.g., amilorid, triamterene, and spironolactone have the common generalization potassium sparing diuretic)."/> <immutable value="true"/> <compose> <include> <system value="http://terminology.hl7.org/CodeSystem/v3-ActRelationshipType"/> <filter> <property value="concept"/> <op value="is-a"/> <value value="GEN"/> </filter> </include> </compose> </ValueSet>