On 8/16/06 8:57 AM, "Rex Brooks" <rexb@xxxxxxxxxxxxxx> wrote:
> I find this thread curiously satisfying, since it is covering a
> number of developments I have been involved with and/or following for
> several years now. The mention of Siderean Seamark, about which I
> learned a little last year, and the notion of quads, in addition to
> triples leads to what I happen to think is the next major task that
> needs to be tackled (most likely by the W3C), namely moving RDF from
> "triples" to "tuples" to pave the way for "n-ary databases." (01)
There does in fact appear to be a solution to this problem (which I've only
recently been made aware of myself). Calvanese, De Giacomo, and Lenzerini
in their paper "A Framework for Ontology Integration"
(http://tinyurl.com/reamq) describe a description logic DLR with n-ary
relations that extends the description logic underlying OWL-DL without
increasing its complexity. It is straightforward to encode DLR in OWL-DL.
For some reason this information does not seem to have made its way into the
work of the W3C committee that is investigating n-ary extensions to RDF. I
am not an expert on OWL or DLs, but FWIW I am unable to see any theoretical
reasons why a DLR encoding wouldn't do the job. (02)
Chris Menzel (03)
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