Raw

Following the SWBPD doc Defining N-ary Relations on the Semantic Web: Use With Individuals, Yoshio Fukushige has done what he intends as a generalization of "pattern 2″, the one with roles:



:Purchase_1

   a :Purchase ;

   :buyer :John ;

   :object :Lenny_The_Lion ;

   :purpose :Birthday_Gift ;

   :seller :books.example.com .



PS. d'oh! here's the link to Yoshio's material

The examples go further into covering roles, themes, and also look at causal relationships and uncertainty (something that's interested me for a long time ). In a sense these are a specialised use of the generalized structural pattern, but really common (and useful!).

With the treatment of roles and themes I was reminded right away of Sowa and co's Conceptual Graphs (especially since I was looking at them half an hour earlier). Yoshio has nicer graphics ;-)

Hmm, I wonder if this may also help with my simmering project modelling stuff - which came up yet again yesterday when talking about a rules engine.