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prefix with relative IRI

From: Peter Danielsen <wiscal@gmail.com>
Date: Thu, 11 Oct 2012 12:47:39 -0500
Message-ID: <CADyMoSyW5wJVJP1SO5vm-ibtdLXmNtVaWxHoKV+3P358N0y40Q@mail.gmail.com>
To: public-rdfa@w3.org
Hi,

I have an example where I'm using a prefix whose reference is a relative
path, e.g.
    <body prefix="ex: http://example.com/schema# ovw: overview.html#">
        ...
        <link rel="ex:r" resource="ovw:o1" />
        ...
    </body>
I get different results for the triples I get back from different RDFa
processors.  If the document is at http://www.example.com/index.html, one
RDFa processor will say that the object's IRI is "overview.html#o1", and
the other will say its "http://www.example.com/overview.html#o1".  My
expectation is that it's the latter, the absolute IRI, based on the start
of 7.4:

"Since RDFa is ultimately a means for transporting RDF, a key concept is
the *resource* and its manifestation as an IRI. RDF deals with complete
IRIs (not relative paths); when converting RDFa to triples, any relative
IRIs *must* be resolved relative to the base IRI, using the algorithm
defined in section 6.5 of RFC 3987
[RFC3987<http://www.w3.org/TR/2012/PR-rdfa-core-20120508/#bib-RFC3987>],
*Reference Resolution*."

and the "blue box" just before 7.4.1:

"Note that it is generally considered a bad idea to use relative paths in
prefix declarations. Since it is possible that an author may ignore this
guidance, it is further possible that the IRI obtained from a CURIE is
relative. However, since all IRIs must be resolved relative to
base<http://www.w3.org/TR/2012/PR-rdfa-core-20120508/#T-base>before
being used to create triples, the use of relative paths should not
have any effect on processing."

I'd like to verify that my expectation is correct.

Thanks,

Peter

(The reason I'm using a relative path is so that a group of documents can
be moved from one location to another without having to update the
documents to change their prefix mappings.  It's useful for validation at a
staging location before moving to a production server.)
Received on Friday, 12 October 2012 12:19:51 UTC

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