This is the ValueSet that contains all the codes in US Public Health TriggerDefinition NamedEvent (http://hl7.org/fhir/us/ecr/ValueSet/us-ph-triggerdefinition-namedevent) and US Public Health TriggerDefinition NamedEvent (http://hl7.org/fhir/us/ecr/ValueSet/us-ph-triggerdefinition-namedevent). E.g. what you have to deal with if you get resources containing codes in either of them