RDA: Resource Description and Access
From the website:
RDA: Resource Description and Access is the new standard for resource description and access designed for the digital world. Built on the foundations established by AACR2, RDA provides a comprehensive set of guidelines and instructions on resource description and access covering all types of content and media. (emphasis in original)
In case you are interested in the draft of 2008 version, just to get the flavor of it, see: http://www.rdatoolkit.org/constituencyreview.
More to follow on RDA and topic maps.