This is the ValueSet that contains all the codes in Specification Type Terminology (http://hl7.org/fhir/us/pq-cmc-fda/ValueSet/pqcmc-specification-type-terminology) and Specification Type Terminology (http://hl7.org/fhir/us/pq-cmc-fda/ValueSet/pqcmc-specification-type-terminology). E.g. what you have to deal with if you get resources containing codes in either of them