Re: RDFa Core and RDF/XML

On Mar 29, 2010, at 15:03 , Mark Birbeck wrote:

> 
> 
>> My intention was indeed that an *RDFa* processor should parse the RDF/XML portion, too,
>> and add it to the RDF graph that is produced. Writing these lines made me realize, however,
>> that this *is* an extra load on an RDFa processor, so it is not so obvious after all:-(
> 
> I think it's conceptually wrong, too. Whilst an abstract 'RDF parser'
> might process many serialisations, it would be wrong to expect a
> parser that handles one serialisation to take on board other
> serialisations.

Yeah, I think you are right.


> 
> (Which in passing is one of the reasons for introducing the notion of
> the 'default graph' into RDFa; it gives us a fighting chance of
> ensuring that all triples from all parsers end up in the same place.)
> 
> 
>> It is certainly true that an engine extracting metadata from an SVG file that wants to be
>> conform to the SVG standard has to do both the RDF/XML and the RDFa processing. But
>> that may be then a tool's own option (my distiller does that).
> 
> Right, but that would be an 'RDF processor' that just happens to
> incorporate both an RDF/XML parser and an RDFa parser.
> 
> 
>> Whatever we decide, we may want to add an informal note to the RDFa 1.1 Core about this.
>> It is, I think, an obvious questions user may ask themselves.
> 
> If we did make such a note, perhaps it would be in relation to notions
> of the default graph, rather than processors? That's the main way that
> different parsers can align their triples.
> 
> Or maybe we clarify this point about an RDF processor containing one
> or more parsers, and say that all parsers running in the context of
> the same RDF processor should ideally populate the same default graph.
> 

I think that would be my preferred way.

Ivan



> Regards,
> 
> Mark
> 
> --
> Mark Birbeck, webBackplane
> 
> mark.birbeck@webBackplane.com
> 
> http://webBackplane.com/mark-birbeck
> 
> webBackplane is a trading name of Backplane Ltd. (company number
> 05972288, registered office: 2nd Floor, 69/85 Tabernacle Street,
> London, EC2A 4RR)


----
Ivan Herman, W3C Semantic Web Activity Lead
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