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  1. CTS2 needs to be able to represent multiple versions of a coding system. The interface needs to support:
    1. Enumeration of the versions supported by the interface
    2. The ability to query version history concept code - when it was introduced, when it was changed, when it was withdrawn, what happened to it, etc.
    3. The ability to select a specific version of a terminology and make queries relative to that version
  2. (Who needs this? - I don't know)
  3. This needs to be standardized because it is a generic issue that crosses specific terminologies
  1. Questions and issues:
    1. How do versions fit into the HL7 CD Data types?