This is the ValueSet that contains all the codes in x_ActMoodDefEvnRqo (http://terminology.hl7.org/ValueSet/v3-xActMoodDefEvnRqo) and x_ActMoodDefEvnRqo (http://terminology.hl7.org/ValueSet/v3-xActMoodDefEvnRqo). E.g. what you have to deal with if you get resources containing codes in either of them