<status value="active"/> <date value="2014-03-26"/> <description value="Represents the act of maintaining information about the registration of its associated registered subject. The subject can be either an Act or a Role, and includes subjects such as lab exam definitions, drug protocol definitions, prescriptions, persons, patients, practitioners, and equipment. The registration may have a unique identifier - separate from the unique identification of the subject - as well as a core set of related participations and act relationships that characterize the registration event and aid in the disposition of the subject information by a receiving system.*Usage notes:* "/> <immutable value="true"/> <compose> <include> <system value="http://terminology.hl7.org/CodeSystem/v3-ActClass"/> <filter> <property value="concept"/> <op value="is-a"/> <value value="REG"/> </filter> </include> </compose> </ValueSet>