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RE: A simple question....

From: Stefan Decker <stefan@DB.Stanford.EDU>
Date: Wed, 17 Nov 1999 15:45:26 -0800
Message-Id: <4.2.0.58.19991117154330.00b2d6a0@db.stanford.edu>
To: www-rdf-interest@w3.org
Hi Ora,

At 04:30 PM 11/17/99 +0200, you wrote:
>Stefan,
>
>you raise a very interesting question. As I recall, it was actually at one
>time discussed in the RDF working group.
>
>I believe what you are suggesting is a deeper question than something that
>has to do with RDF, and in the case of your example, relates to the
>semantics of URL fragments of HTML files (i.e., what exactly is #myname in
>this case? One point in the file, I suspect, since we do cannot address
>"ranges").
>
>Maybe we should think about attaching RDF annotations to HTML <SPAN>
>elements...?
l
The question is probably: "Whats in a Link?".
Pointing to some text in an HTML document is useful, if the document change 
frequently
(if documents are static then the information can be copied)
Maybe RDF should distinguish different kind of links and specify the semantics?
(e.g. a link pointing to a literal)
Using SPAN could be a way of doing this for HTML, but this must be 
standardized
(writing a Note?)

To make a more general point:
If one views RDF as a simple Frame system, then there are two things which
distinguish it from other frame formalism:

1) It is distributed in an uncontrolled fashion
2) It is linked to Web-Resources

both aspects have to be handled very carefully, because they introduce 
something new
to well known representation formalism.
E.g. 1) Introduces the aspect, that metadata has a source, and there might 
be sources i consider  more reliable than others.
            So i want to be able to distinguish between metadata from 
different sources.
            RDF datamodel does not allow that (the datamodel does not trace 
the origin of a triple)

The second aspect (links) means, that it has to be declared, what it means 
to link to something on the web.
and to distinguish between different types of links (which are useful in 
applications).

Opinions?

Ciao,

         Stefan



>Regards,
>
>         - Ora
>
> > ----------
> > From:         EXT Stefan Decker
> > Sent:         Wednesday, November 17, 1999 03:02
> > To:   www-rdf-interest@w3.org
> > Subject:      A simple question....
> >
> > Hi,
> >
> > a question and maybe an RDF 2.0 requirement ;-)
> >
> > Lets say, i have the following HTML-code in my homepage
> > (e.g. http://www.aifb.uni-karlsruhe.de/~sde ;-)
> >
> > ...
> > <center><A name="myname">Stefan Decker</A></center>
> > ...
> >
> > In which respect are the following RDF-snippets identical?
> >
> > 1)
> >
> >    <rdf:Description about="http://www.aifb.uni-karlsruhe.de/~sde">
> >        <s:Creator>Stefan Decker</s:Creator>
> >      </rdf:Description>
> >    </rdf:RDF>
> >
> >
> > 2)
> >    <rdf:Description about="http://www.aifb.uni-karlsruhe.de/~sde">
> >        <s:Creator
> > resource="http://www.aifb.uni-karlsruhe.de/~sde#myname"/>
> >      </rdf:Description>
> >    </rdf:RDF>
> >
> >
> > I know that they will produce different triples, but is there a way
> > to guarantee, that an application behaves the same, regardless what it
> > will get?
> >
> > Background:
> > We have created an extended WYSIWYG-HTML-Editor, which allows to semantic
> > annotation of text. One simply marks the text and selects the
> > class/attribute from an ontology. Semantic Markup is inserted into
> > the HTML-text.
> > However, the editor now supports the ontobroker-annotation language,
> > but i would like to switch this to RDF (we worked on that concept
> > before RDF was born...)
> >
> > On the other side, i don't want to COPY the marked text from of the
> > HTML-page,
> > but would like to POINT to it. Otherwise if the HTML-page changes the
> > metadata will be invalidated, and thats something i would like to
> > avoid.
> >
> >
> > Thanks,
> >
> >       Stefan
> >
> >
Received on Wednesday, 17 November 1999 18:46:07 GMT

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