W3C home > Mailing lists > Public > www-rdf-interest@w3.org > July 2002

RE: Objects as RDF subgraphs

From: Danny Ayers <danny666@virgilio.it>
Date: Wed, 17 Jul 2002 21:15:03 +0200
To: "Damian Steer" <dsteer@hp.com>, <www-rdf-interest@w3.org>
Message-ID: <EBEPLGMHCDOJJJPCFHEFKENPHBAA.danny666@virgilio.it>

I've been working on this problem for a similar purpose, though haven't come
up with any magic. What looks most promising to me so far is to take
advantage of the topology of the graph (something you shouldn't have too
much trouble with after RDFAuthor ;-) The wrapping ('folding' is the term
I've been using) might start at any particular point in the graph, and
examine the neighbouring nodes. If it finds something that can act as a
terminus (a non-bNode resource) then it stops there and carry out the same
test in different directions, until a little cluster that can stand alone is
formed, which may be given an ID. This can be applied recursively, applying
the same approach to the terminals of the cluster to produce a larger
grouping (of course you don't need to give it an ID until you've got
everything you want). kindaLike striping in circles. The problem of how you
know you've got everything you want in the box is the kind of thing a query
language might be good at, and the ID issuing could almost certainly be
simplified using something like Seth's quads, but I reckon both of these
would depend a lot on other requirements/facilities of the app (simply
adding another property to each of the members of the cluster would be an


Danny Ayers
<stuff> http://www.isacat.net </stuff>

Idea maps for the Semantic Web

>-----Original Message-----
>From: www-rdf-interest-request@w3.org
>[mailto:www-rdf-interest-request@w3.org]On Behalf Of Damian Steer
>Sent: 17 July 2002 13:47
>To: www-rdf-interest@w3.org
>Subject: Objects as RDF subgraphs
>Hash: SHA1
>I'm about to start work on an(other) rdf browser. The idea is to
>present rdf data in a 'coarse grained' way - eg vcard data as a box
>containing name, tel no, photo etc.
>The tricky bit will be the coarse graining. I'm considering
>auto-generating classes which will pick out sub-graphs of an
>underlying rdf model.
>The question is - how? It seems like the best thing to use would be an
>rdf query to a) express what subgraphs the class 'wraps' and maybe b)
>represent the fields of the class.
>eg for rdfDB [1] style queries the 'WHERE' clause corresponds to a)
>and the SELECT clause (maybe) gives b).
>I'm a lazy guy, so is anyone else doing something similar, or know of
>similar projects? I've been looking at neoom [2] (thanks keo) and MDL
>[3] (thanks danbri).
>The problem of wrapping seems to crop up quite alot in rdf apps so any
>work would help poor hackers. It also seems to relate to data
>validation (eg Schemarama [4]).
>Damian Steer
>[1] rdfDB <http://www.guha.com/rdfdb/>
>[2] NEOOM <http://www.nesstar.org/sdk/>
>[3] MDL <http://www.charteris.com/mdl/>
>[4] Schemarama <http://ilrt.org/discovery/2001/02/schemarama/>
>Version: GnuPG v1.0.6 (GNU/Linux)
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Received on Wednesday, 17 July 2002 15:22:54 UTC

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