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Re: RDF/XML Syntax Oddity

From: Arjohn Kampman <arjohn.kampman@aduna.biz>
Date: Wed, 11 Aug 2004 13:34:46 +0200
Message-ID: <411A0456.2010907@aduna.biz>
To: Ian Davis <iand@internetalchemy.org>
Cc: www-rdf-interest@w3.org

Ian Davis wrote:
> 
> The following RDF/XML different results depending on the parser used:
> 
> <rdf:RDF
>   xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
>   xmlns:ns1="http://example.com/">
> 
>   <rdf:Description>
>     <ns1:pred rdf:value="bar"><rdf:Description/></ns1:pred>
>   </rdf:Description>
> </rdf:RDF>
> 
> 
> Raptor and James Carlyle's XSLT based parser both give a single triple 
> of the form:
> 
> _:genid1 <http://example.com/pred> _:genid2 .
> 
> The W3C online validator gives two triples:
> 
> genid:ARP76637     http://www.w3.org/1999/02/22-rdf-syntax-ns#value     
> "bar" .
> genid:ARP76636     http://example.com/pred     genid:ARP76637 .
> 
> and an error: "Syntax error when processing start element 
> rdf:Description. rdf:Description elements generally may only occur to 
> describe an object.[Line = 4, Column = 30]"
> 
> I'm not entirely sure who is right. Does anyone else have any ideas?

Hi Ian,

The RDF/XML fragment doesn't appear to be correct as it doesn't match
the grammar specified in [1]. Therefore, the parser is supposed to
report a warning or error upon parsing the data, which is what the
online validator does. FWIW: Sesame's parser reports the following
error: Warning[line=6; column=49]: unexpected attribute 'rdf:value'.

Arjohn

[1] http://www.w3.org/TR/rdf-syntax-grammar/

-- 
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Received on Wednesday, 11 August 2004 11:34:55 UTC

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