This is the CodeSystem that contains all the codes in Citation Classification Type (http://terminology.hl7.org/CodeSystem/citation-classification-type) and Citation Classification Type (http://terminology.hl7.org/CodeSystem/citation-classification-type). E.g. what you have to deal with if you get resources containing codes in either of them
Generated Narrative: CodeSystem 0810ecd3-570a-43d7-a673-d001af6fd6e3-692
This code system http://hl7.org/fhir/comparison/CodeSystem/0810ecd3-570a-43d7-a673-d001af6fd6e3-692 defines codes, but no codes are represented here