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Re: rdfs:isDefinedBy (Was Re: Representing DCMI semantics asRDFschemas versus Web pages)

From: Patrick Stickler <patrick.stickler@nokia.com>
Date: Fri, 07 Jun 2002 12:50:02 +0300
To: Patrick Stickler <patrick.stickler@nokia.com>, ext Daniele Capursi <capursi@sword.it>, RDF Interest <www-rdf-interest@w3.org>
Message-ID: <B9265C7A.16505%patrick.stickler@nokia.com>

On 2002-06-07 12:36, "ext Patrick Stickler" <patrick.stickler@nokia.com>

> Well, there are two kinds of or levels of RDF validation. The more
> basic level of validation is the RDF syntax, and that is what the W3C
> RDF Validator checks.
> The higher level of RDF validation is RDF Schema validation, which tests
> that range and domain constraints match the subjects and objects of
> actual statements. The W3C RDF validator does not perform such checks.

A third level of validation, which I probably forgot to mention due
to my subconscious trying to block out all thought of it ;-) and
which is particulary unforgivable since I'm a co-editor of the RDF
Datatyping specification) is datatyping validation, whereby literal
values are validated according to all associated datatypes (e.g. is the
literal "000.5" a valid xsd:integer, etc.

Whereas the first two levels of validation can be done "generically"
based solely on the RDF/XML instance and RDF graph respectively,
this third level of datatyping validation requires knowledge that is
not expressed in the RDF graph -- namely the definitions of the
datatypes themselves, and thus must be performed by an application
external to RDF, which understands the semantics of the datatypes
in question.



Patrick Stickler              Phone: +358 50 483 9453
Senior Research Scientist     Fax:   +358 7180 35409
Nokia Research Center         Email: patrick.stickler@nokia.com
Received on Friday, 7 June 2002 05:46:00 UTC

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