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As of Dec 2011:
DCAT has no "official" status (yet)
The version that most people refer to here http://bit.ly/imvRX1 "Data Catalog Vocabulary/Vocabulary Reference"
The most recent version is the W3C Working Draft http://bit.ly/voaxm5 "Data Catalog Vocabulary (DCAT) W3C Working Draft 18 December 2011"