Common Terminology Services is both the name of a project as well as of a specification.
The project has published a CTS specification, known as Release 1, or CTS I, and is working on Release 2, known as CTS 2.
There is a product description with much more detail available at Product_CTS
CTS 2 Normative(Release 2 of Common Terminology Services Normative edition)
CTS 2 (Release 2 of Common Terminology Services)
CTS I (Release 1 of Common Terminology Services)
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