owl

Publishers and semantic web technology

A response to Dale Waldt's Gilbane XML posting on semantics and the web.

My old friend Dale Waldt (I remember, immediately after the announcement of the existence of XML at SGML 1996, going up to my then-coworker Dale and asking “So what do we think?") recently posted an entry on the Gilbane XML blog titled Why Adding Semantics to Web Data is Difficult. A few days ago I posted a comment saying that the things that he saw as missing from semantic technologies are actually already there and working well, but my reply hasn’t shown up yet, so after a bit…

Adding metadata value with Pellet

A nice new feature of Pellet 2.0.

The open-source program Pellet is described as an OWL reasoner, but I’ve used it mostly as a SPARQL engine that happens to understand OWL. So, for example, if I have RDF that says “Loretta’s spouse is Leroy and spouse is a symmetric property,” but the data makes no mention of Leroy’s spouse, and I ask Pellet “who is Leroy’s spouse,” it can give me the answer.