Re: followup from telecon (integration of XML and RDF)

From: Stefan Decker (
Date: 11/30/01

At 03:46 PM 11/29/2001, Pat Hayes wrote:
>>thanks for your answer.
>>I'm still not clear if I could represent an interpretation graph
>>in RDF, given the right vocabulary.
>My reply would be: suppose you can. So what? Ie what significance would 
>you attribute to the ability to describe such a structure in RDF?

my understanding is, that RDF can serve as a universal data model - thus
representing any structured data. Thus investments in RDF can be
justified by the reusability of the results.

If this is true, tools suitable to store and query RDF data can be used for XML
documents as well, if Peter's interpretation of XML documents is applied.

If RDF is not suitable as a universal data model, I would like to figure out
why not.

>(PS. BTW, it depends on what you mean by 'describe', by the way. If you 
>mean, can you make an RDF graph that is isomorphic, then of course you can 
>if the interpretation is finite, and not if it is not.
Hm, we are talking only about finite amounts of data, right?
>If you mean, can you write some RDF so that SOME interpretation of it is 
>isomorphic, the answer is yes, trivially; if you mean, write some RDF so 
>that ALL interpretations are isomorphic, the answer is no. If you mean, so 
>that all interpretations in some class of interpretations are isomorphic, 
>(eg all 'minimal' interpretations in some sense), then say what class you 
>have in mind.
My question was if there are computable functions f, fi, with f maps an
XML interpretation to an RDF graph, such that fi o f = id.
Is it the last case?

All the best,


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