W3C home > Mailing lists > Public > w3c-wai-er-ig@w3.org > July 2001

Re: EARL 1.0

From: Sean B. Palmer <sean@mysterylights.com>
Date: Mon, 16 Jul 2001 14:26:17 +0100
Message-ID: <008a01c10dfb$00ca60e0$17ec93c3@z5n9x1>
To: "Charles McCathieNevile" <charles@w3.org>
Cc: <w3c-wai-er-ig@w3.org>
>   [...] but CWM is it. It's the only Semantic Web tools
>   available that's worth anything, and it's demonstration code.
> CMN
> Err, are you sure?

Sure that CWM is the only decent SW tool (inference-wise), or sure
that it's demonstration code? I'm sure of both. XSB is the only other
thing that will get the job done (apparently), but I can't install it
on Win98, so I can't test out that theory. SWI-Prolog does something a
little similar, but CWM is still the only SW tool that can really be
used.

[...]
> The model is most of it. A syntax that is portable, easily handled,
> widely recognised does make a difference. That was the reason
> for promoting XML RDF syntax as the primary syntax.

Heh! Good one, Chaals :-)

[...]
>   ... But did we stop to question if the context => { content result
>   criteria } is the most efficient way of going about it?
> [...] CMN: [...] the expression above is not what we had in earl
> 0.9 as a method of expressing things, where there was an extra
> layer of indirection everywhere.

Pardon?

[...]
>      :Sean :asserts :x .
>      :x :s :MyPage; :p :passes; :o :MyTest .
> CMN
> So the differnce here is that in N3 you have made the first
> statement explicitly an "anonymous node" (i.e. one without
> a URI), and have implied that the second one is not (there
> is no proof here either way). I agree that the assertions should
> not be anonymous nodes, and using XML syntax they aren't
> - they can be identified by Xpointers.

No, you can't point into RDF files using XPointers (at least when
using text/xml or application/xml) to point at triples, because
they're part of the model, and not the syntax. When you point to an
element within RDF, you only point at the element (although this area
is fuzzy - what does a FragID really point to?). Jonathan Borden came
up with a proposal for an RDFPath thing, that would enable one to
point to triples, but it's just a draft for now.

Anyhoo, yes, in the second version I simply gave an ID to the reified
statement. Anonymous nodes are another fuzzy area in RDF (there's an
issue about them on the issues list).

Cheers,

--
Kindest Regards,
Sean B. Palmer
@prefix : <http://webns.net/roughterms/> .
:Sean :hasHomepage <http://purl.org/net/sbp/> .
Received on Monday, 16 July 2001 09:26:04 GMT

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