W3C home > Mailing lists > Public > w3c-rdfcore-wg@w3.org > February 2002

Re: URIs vs. URIviews (was: Agenda for RDFCore WG Telecon 2002-02-15)

From: Pat Hayes <phayes@ai.uwf.edu>
Date: Thu, 14 Feb 2002 18:02:51 -0500
Message-Id: <p05101429b891f08d893d@[]>
To: Aaron Swartz <me@aaronsw.com>
Cc: w3c-rdfcore-wg@w3.org
>I notice that Brian seems ready to close all the little naggling issues. I
>think this is great but I don't want to see some issues drop thru the
>cracks. Particularly, I'm worried about the URI-vs-URIviews issue, which I
>thought we agreed to put on the issues list, but I don't seem to see it.
>Specifically in:
>>  16: Issue rdfms-fragments
>>  Propose:
>>  o The WG resolves that the meaning of absolute
>>    URI's with fragment ID's is a matter of web architecture and
>>    beyond the scope of this WG and that this issue be closed.
>>  See:
>>  http://www.w3.org/2000/03/rdf-tracking/#rdfms-fragments
>I really can't agree with this. It's our problem that RDF uses this
>non-standard piece of Web architecture, and in doing so has incurred all
>sorts of problems. If we're going to be the Resource Description Framework,
>we need we're actually describing resources. My ideal resolution would look
>  o The WG resolves that the use of absolute URIs with fragment IDs is a
>    to identify Web resources is relatively incompatible with current Web
>    architecture.

In what way??

>  o We recommend that RDF users refrain from using '#' in their Resource
>    identifiers and namespaces.

Aaargh!!  No, we don't. Such use is ESSENTIAL. How else can one 
ontology use the names used in another ontology??

>RDF developers and tool creators may present
>    a warning to the user when using resource identifiers with '#' in them.
>  o We understand the need to identify portions of Web entities (data used to
>    describe a resource, such as the data returned when making an HTTP GET
>    request). We recommend that they identify such Resources using something
>    along the lines of:
>_:x rdf:type web:Fragment .
>_:x web:resource <http://www.w3.org/2001/tag/ilist> .
>_:x web:fragID "w3cMediaType-1" .
>_:x dc:date "2002-02-14T13:03Z" .
>My goal is to:
>  a) raise awareness about the problem while
>  b) maintaining backwards-compatibility but
>  c) lay the ground work for future WGs to fix this bug

My goal is prevent URIs becoming completely unusable in web ontologies.

>>  (d) choose namespace names that end in non-xml-name-characters
>>  such as / # ?
>I think perhaps we should provide some warning about using # in namespace
>names, dependent on the resolution of rdfms-fragments.
>you're-not-getting-off-that-easy-'ly yrs,

Wait a minute. Whats the 'bug' here? If RDF (and DAML and OWL and...) 
are required to use urirefs  for all identifiers, and if urirefs have 
no way to be [a name as used inside another ontology which is in turn 
identified by a URI], then the entire semantic web is dead in the 
water. This absolutely MUST be possible somehow. Syntactic problems 
with URI formats are a comparatively unimportant technical issue. I 
would be very unhappy indeed if we were to go on record as 
deprecating the use of # if there isn't anything else to take its 
place. Without that, or something equivalent to it, web ontology use 
is impossible. And it had better be reasonable to use. That 
four-triple monstrosity is unusable, in particular.


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Received on Thursday, 14 February 2002 18:02:51 UTC

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