- From: Bijan Parsia <bparsia@isr.umd.edu>
- Date: Tue, 3 Feb 2004 15:32:00 -0500
- To: Pat Hayes <phayes@ihmc.us>
- Cc: public-sws-ig@w3.org
On Feb 3, 2004, at 2:23 PM, Pat Hayes wrote: >> If OWL-S ontologies are to be OWL-DL, then we must eliminate all >> "extraneous" use of the RDF collection vocabulary. (That is, we must >> only use rdf:List and friends in certain syntactic situations and >> never as a user level modeling construct.) There are three places >> where we do or might use collections: >> >> 1) As the value of the components property, especially for indicating >> sequences or unordered sets of processes. Note that simply avoiding >> subclassing rdf:List isn't sufficient. The mere use of lists puts us >> in OWL Full. > > Restrictions like this were SUCH a bad idea. Sigh. The torture that > you are now going through illustrates the reasons why. The entire > OWL-S process is going to be warped in order to save the tool builders > the trouble of having to do some intelligent parsing. [snip] >> c) Do something exceedingly clever with literals. Literals already >> *have* structure (both xml and the simpleType, list). I forgot d) encourage DL tool builders to handle some relaxations on the Collection restrictions. Preferably by publishing a clear description of those relaxations and the consequences thereof. >> Any thoughts, preferences, screams of pain anyone would like to share? > > Thought: Serves you right for trying to fit into OWL-DL > > Preference: use option (a). There is almost no semantics associated > with rdf:List etc. that couldnt be associated with owl:List or even > fred:List. To hell with parseType, its a crock anyway. > > Option (b) is more work for no perceptible advantage, and option (c) > is a Really Bad Idea. Really Really Bad. :) I thought you'd like that one. > Screams of pain: I would be emitting them if I thought that I had to > use OWL-DL. Poor Pat. Oh wait...:) The consensus of today's telecon, however much Drew squawked, is some variant of (a), though maybe with some helpful scripts to ease the pain. Cheers, Bijan Parsia.
Received on Tuesday, 3 February 2004 15:31:40 UTC