This is the CodeSystem that contains all the codes in Days Of Week (http://hl7.org/fhir/days-of-week) and Days Of Week (http://hl7.org/fhir/days-of-week). E.g. what you have to deal with if you get resources containing codes in either of them
Generated Narrative: CodeSystem 557d853a-8aa7-4722-9b4a-6a18e06a68c1-329
This code system http://hl7.org/fhir/comparison/CodeSystem/557d853a-8aa7-4722-9b4a-6a18e06a68c1-329
defines codes, but no codes are represented here