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   Re: [xml-dev] Syntax vs semantics

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Linda Grimaldi wrote:

> Once again, I am confused.  I like the nice, clean distinction offered by
another list member- XSD for syntax, RDF and its related standards for
semantics.  But then there are things like element substitution and,
effectively, subclassing, in XSD that strike me as much too closely
resembling semantics.  Seems to me those kind of things should be handled
via RDFS/OWL, not XSD.

There is an interface between the two. Consider numbers. We would like the
following strings


to compare as being equal. Applying an XSD type e.g. xsd:integer allows an
RDF/OWL inferencing engine to determine that the properties whose values are
given by these strings have values that are identical.

RDF/OWL otherwise have no innate knowledge of things like dates and numbers
for which it is frequently very useful to order, compare etc. not on the
basis of their UNICODE sequences, but rather on the basis of their values.

> I am in the throes of developing my first real ontology- any advice on
this?  Is it simply a question of what validation mechanisms you have handy?
I hope not.

Try http://www.w3.org/TR/owl-guide :-) Perhaps it is how you define the term
_ontology_ but I haven't heard folks suggest that RNG or XSD are really
appropriate ways to define these (in and of themselves).



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