From: Dan Brickley (Daniel.Brickley@bristol.ac.uk)
Date: 06/24/01
Thanks, that's a handy summary. Mind if I pass this on to the relevant W3C groups? (Semantic Web Coordination Group; RDF Core WG; RDF Interest Group...). Regarding RDF Schema, I intend to open up discussion of some RDFS issues within the RDF Core WG shortly. Will keep you posted... cheers, Dan On Sun, 24 Jun 2001, Peter F. Patel-Schneider wrote: > As promised, here is my initial list of coordination points between RDF(S) > and DAML+OIL. > > peter > > > Coordination between RDF(S) and DAML+OIL > > - what does DAML+OIL depend on from RDF(S) > - RDF - basic triple model > - RDFS - basic RDFS classes - CLASS, RELATION, ... > - class organization - subclass, subproperty(?) > - structuring relationships - domain, range, ... > > - what does DAML+OIL not use at all > - RDF - reification - not needed, not understood > - containers - wrong properties for our purposes > - RDFS - meta-class organization - not needed > - ... > > - what changes does DAML+OIL require > - RDFS - multiple domains - allow, with conjunctive reading > - multiple ranges - change from disjunctive to conjunctive reading > - subclass can be reflexive - > > - what areas are problematic > - fit in the middle > - have problems > - are missing from RDF(S) > - datatypes - currently in DAML+OIL > - should be in RDF(S) > - simple class organization - currently in RDFS > - should be ??? > - reification - lots of problems > - ... > - containers - need semantic justification > - perhaps move elsewhere ? > - domains and ranges - problem with multiple domains and ranges > - metaclasses and extensibility - ? > - no structure for information in RDF(S) > > - other issues > - RDF and RDFS are not good layers > - both provide simple stuff, but both also provide suspect stuff > - RDF - triples / reification > - RDFS - frames / global ranges, but no local restrictions > - RDF gives meaning to all syntax > - makes it hard to define extensions > - what is a URI? - syntax and semantics > >
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