Dan,

It's a rather more practical matter: RDQL only returns
Resource/Property/Literal objects - not the higher-level DAML objects that
the DAML sub-system of Jena has that get via the DAML API. Also, it does
not currently (to be changed) have access to the implications of the DAML
inference even though these manifest themselves as virtual triples.

Andy

-----Original Message-----
From: Dan Brickley [mailto:daniel.brickley@...]
Sent: 27 April 2002 22:35
To: 'jena-dev@yahoogroups.com'
Subject: RE: [jena-dev] DAML question (was: Error when using rdfquery
Mod ule)


On Sat, 27 Apr 2002, Seaborne, Andy wrote:

> N.B. RDQL querys RDF as data - you would not get DAML inference as a
result
> of an RDQL query.

This phrase has always puzzled me! RDF just is a data format for making
propositional claims about the world. So all RDF query is about querying
data, in that sense. This is true even if RDF is used to ask questions of
'smart' servers. I think I know what you mean: RDQL, Squish, Algae, RDFdb
etc provide query languages for RDF that don't have any rule-oriented,
inference-oriented features in the language. So maybe it's not that the
RDF is being queried 'as data' vs 'as knowledge', 'as a KB' etc. Just that
the query protocol is very simple, it doesn't allow one to talk about
inferences, rules etc.

Dan



To unsubscribe from this group, send an email to:
jena-dev-unsubscribe@yahoogroups.com



Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/