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