Protégé is an open source ontology and knowledge-base framework, with support for RDF and OWL, and a bunch of other stuff I don't understand. Neat, though.
This is BrainLog, a blog by Dan Sanderson. Older entries, from October 1999 through September 2010, are preserved for posterity, but are no longer maintained. See the front page and newer entries.
April 8, 2005