> I have read the article "Practical Knowledge Representation for the Web" ( > http://www.cs.vu.nl/~frankh/postscript/IJCAI99-III.html#Calvanese:98AAAI ) and to my surprise, RDF > is depicted as an immature and disappointing language for representing semantics. This is in clear > contrast with the promise of RDF as the language to make the Semantic Web come true. > The authors could be biased as they come from the AI world, but nevertheless, their arguments seem > well founded to me. thanks for the link; very interesting article > Does anyone have comments on this article? I do :) - about nesting (3.3) I think the author are quite unfair : RDF CAN do nesting. Sure it is more verbose than plain XML, and hence less readable - is this what they mean when they write that nesting is not expressible "in a natural way" ? Furthermore, this is a syntactical issue, and I think the whole RDF community agrees on the necessity of a simplified syntax. (Personnaly, I'm even much confident in an attribute-based syntax - in the XLink fashion - allowing to interpret any XML tags as RDF). - about RDF beeing property-centric (4.1) ah ! This is always the itchy part for people used to object oriented models. I believe this is not a mistake, though : once a property has been defined, any new schema can use it, and therefore be (partially) understood by anyone understanding that property.This is the whole point - and this is possible because the domain of a property can ALWAYS be extended (since it is not bound to be unique). About translating Ontobtoker ontology into RDFS (4.2) , prefixing class-names to property-names is not the best solution : using a different namespace for each class is much more elegant. - about inferences (4.3) here is the most unfair point, IMHO : the kind of inference proposed here is straightforward in RDFS with subPropertyOf. Anyone seeing anything I forgot ? Pierre-Antoine _______________________________________________________ Vendez tout... aux enchères - http://www.caraplazza.com
Received on Tuesday, 11 April 2000 09:14:34 UTC