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 315e1367-3f8c-499a-bde0-f49d698cf03c-152
This code system http://hl7.org/fhir/comparison/CodeSystem/315e1367-3f8c-499a-bde0-f49d698cf03c-152 defines codes, but no codes are represented here