Versioning

1. Description: 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 The ability to query version history concept code - when it was introduced, when it was changed, when it was withdrawn, what happened to it, etc.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 it and why? - VHA
3. Why should this be standardized? - 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?

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