RE: INSEE releases OWL ontology and RDF data for geographical entities

Xiaoshu,

Le samedi 05 août 2006 à 17:45 -0400, Xiaoshu Wang a écrit :
[...]
> The reason for me to raise this question is this.  Unlike hash URI, the
> namespace URI can not be "inferred" or "guessed" from a URI itself.  For
> instance, a URI of http://foo.com/bar can be constructed with namespace
> http://foo.com/, http://foo.com/b or http://foo.com/ba coupled with local ID
> of "bar", "ar" and "r", respectively.

That's just a minor detail since all this would be bad practises, but in
the same horrors show category, I don't see why you couldn't define
namespace names such as http://foo.com#b or http://foo.com#ba and hashes
do not allow to "infer or guess" (as you say) namespaces names more
reliably than slashes :) !

Note that the RDF recommendation gives a rule about how this kind of
"inference":

"It is recommended that implementors of RDF serializers, in order to
break a URI into a namespace name and a local name, split it after the
last XML non-NCName character, ensuring that the first character of the
name is a Letter or '_'. If the URI ends in a non-NCName character then
throw a "this graph cannot be serialized in RDF/XML" exception or
error."

This means that if your namespace URI ends with a letter, you won't have
roundtrip.

Eric

-- 
GPG-PGP: 2A528005
Le premier annuaire des apiculteurs 100% XML!
                                                http://apiculteurs.info/
------------------------------------------------------------------------
Eric van der Vlist       http://xmlfr.org            http://dyomedea.com
(ISO) RELAX NG   ISBN:0-596-00421-4 http://oreilly.com/catalog/relax
(W3C) XML Schema ISBN:0-596-00252-1 http://oreilly.com/catalog/xmlschema
------------------------------------------------------------------------