This is the ValueSet that contains all the codes in Observation TriggeredBy Type (http://fhir.ch/ig/ch-lab-order/ValueSet/observation-triggeredby-type) and Observation TriggeredBy Type (http://fhir.ch/ig/ch-lab-order/ValueSet/observation-triggeredby-type). E.g. what you have to deal with if you get resources containing codes in either of them