W3C home > Mailing lists > Public > w3c-rdfcore-wg@w3.org > February 2002

Re: scope of parseType [was: Re: Flower Power and Datatyping ~:-)]

From: Dave Beckett <dave.beckett@bristol.ac.uk>
Date: Tue, 05 Feb 2002 13:29:47 +0000
To: Brian McBride <bwm@hplb.hpl.hp.com>
cc: Sergey Melnik <melnik@db.stanford.edu>, Patrick Stickler <patrick.stickler@nokia.com>, w3c-rdfcore-wg@w3.org
Message-ID: <1029.1012915787@tatooine.ilrt.bris.ac.uk>
>>>Brian McBride said:
> At 11:24 05/02/2002 +0000, Dave Beckett wrote:
> > > That isn't what I expected for parseType="Resource".  Dave, what does the
> > > syntax doc say about that?
> My fault Dave, my question wasn't clear.  What triples are generated for:
>    <rdf:Description>
>      <ex:foo rdf:parseType="Resource">
>        <ex:foo>
>          <ex:foo></ex:foo>
>        </ex:foo>
>      </...
>    </...
> Sergey suggested that:
>   [[
>    Right, but not in the case when parseType declaration applies to all 
> subordinate XML structure (I think that's the way parseType works right now).
>   ]]

That's not correct; it applies to that property element only.

> If that is true, then the second ex:foo above has an implied 
> rdf:parseType="Resource" on it.  This was not my understanding and wanted 
> to check I hadn't missed something.

parseType="Resource" allows the skipping from the usual
   node->arc->node->arc->node->... sequence
by creating a blank node for you off a property/arc.

The above example corresponds to
  [outer blank node]->ex:foo arc->[blank node]->ex:foo arc-> ..
where [blank node] was created by the parseType=Resource

The innermost <ex:foo></ex:foo> creates an empty typedNode completing
the sequence:
 ...->[blank node]->rdf:type->ex:foo

and the parseType resource processing isn't passed on


Full example:

<?xml version="1.0"?>
<rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
    <ex:foo rdf:parseType="Resource">

generates the NTriples corresponding to nodes & arcs above:

_:a <http://example.org/foo> _:b .
_:b <http://example.org/foo> _:c .
_:c <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://example.org/foo> .
Received on Tuesday, 5 February 2002 08:33:22 UTC

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