IVOA Recommendation: The UCD1+ controlled vocabulary Version 1.23
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ucd1documentcontrolledivoaversionvocabularybuildcontent
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This document describes the list of controlled terms used to build the Unified Content Descriptors, Version 1+ (UCD1+). The document describing the UCD1+ can be found at the URL: http://www.ivoa.net/Documents/latest/UCD.html. This document reviews the structure of the UCD1+ and presents the current vocabulary.
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