This Alfresco server extension leverages the Open Calais service to automatically extract semantic metadata from documents stored in Alfresco, has a semantic auto-tagging action service, tag suggest api, enables use of semantic metadata in search. Tags include linked data URIs, and provide geo-location info if available from Calais. Extracted RDF and/or JSON can be optionally associated with documents. Provides a REST api. Also adds an auto-tagging action to the Alfresco web client. The service is implemented in Java (and REST api webs scripts in server side JavaScript). Developed by Alexander Polev (One Point Consulting Limited) and Steve Reiner (Integrated Semantics). Also see FlexSpaces RIA clients for Alfresco (from Integrated Semantics), in the Calais gallery.

FlexSpaces uses this Calais integration and provides Flex based UI for semantic tagging, multiple semantic tag clouds, and a google map displaying geo-location tags.
http://integratedsemantics.org/2008/12/08/calais-integration-for-alfresc...

http://forums.alfresco.com/en/viewtopic.php?f=32&t=15766

http://forge.alfresco.com/projects/calais/

http://www.onepointltd.com/
http://www.integratedsemantics.org
http://www.integratedsemantics.com

http://www.alfresco.com/