Re: Associating a GRDDL transform with an XML schema... and it's not XSLT

Thanks Kevin,

I did wonder whether the simplest/correct thing to do would be to put a 
reference to the POWDER-BASE to POWDER-S XSLT in wdrb.xsd. But... here's 
where the difference between GRDDL and XSLT comes into focus (or my 
understanding goes out of focus, one or the other ;-) ). The 
transformation from POWDER to POWDER-BASE is a defined transform - which 
is defined in the Formal doc. Actually, I guess it's an open question 
whether this is a GRDDL transform or not since the output is still XML 
and not RDF. The POWDER-BASE to POWDER-S transformation is defined in 
the same document -  it just so happens that you are (very helpfully) 
providing an XSLT to effect that transformation which does create 
RDF/OWL from the XML input.

Hence, my query about whether it is actually beneficial to include a 
reference to a human-only processable GRDDL transform.

As you say, however, unless we hear from the GRDDL experts otherwise, 
your plan seems sensible. With a bit of luck, there may be a GRDDLer 
lurking around the south of France next week, you never know...

Phil.

Smith, Kevin, (R&D) VF-Group wrote:
> Hi Phil,
> 
> The normative part is the XML Schema section under
> http://www.w3.org/TR/grddl/#ns-bind . The section of the primer you
> refer to (ref [3] in your mail) applies to XML instance documents (in
> the example given, an XML instance of an MS Excel spreadsheet), and not
> schemas.
> 
> Since the GRDDL transform is from POWER-Base to POWDER, then any
> GRDDL-processing instruction would reside in wdrb.xsd [1], the schema
> for POWDER-Base.
> This would be via inclusion of 
> 
>             xmlns:data-view="http://www.w3.org/2003/g/data-view#"
>  
> data-view:transformation="http://www.w3.org/2003/g/embeddedRDF.xsl"
> 
> ...attributes within the xs:schema element.
> 
> The RDF within xs:appinfo is non-normative, but I'm happy to include it
> that way as it's (a) easily done and (b) may assist GRDDL processors by
> being in the same format as suggested in the spec.
> 
> So unless there are any objections I can add the attributes above, and
> the annotation RDF to the POWDER-Base schema.
> 
> Cheers
> Kevin
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> 
> [1] http://www.w3.org/2007/05/powder/wdrb.xsd 
> 
> -----Original Message-----
> From: Phil Archer [mailto:parcher@fosi.org] 
> Sent: 15 October 2008 12:17
> To: public-grddl-wg@w3.org
> Cc: Smith, Kevin, (R&D) VF-Group
> Subject: Associating a GRDDL transform with an XML schema... and it's
> not XSLT
> 
> Hi,
> 
> As some of you on this list area aware, POWDER associates a GRDDL
> transform with its namespace, the result of which produces POWDER-S. 
> (POWDER is an XML dialect, POWDER-S is RDF/OWL with a twist).
> 
> The transform is defined in our Formal Semantics document [1], currently
> undergoing minor edits to take account of LC comments received. What I'm
> working on right now is getting the right references in the right places
> to make the GRDDL association explicit... and, sorry, I'm confused and
> would greatly appreciate some help.
> 
> We have a (rather complicated) schema at [2]. We have a GRDDL transform
> defined as human-readable text at [1].
> 
> Do we just add a couple of lines like this to the root element of the
> schema?
> 
> xmlns:data-view="http://www.w3.org/2003/g/data-view#"
> data-view:transformation="http://www.w3.org/TR/powder-formal/"
> 
> I ask because the Primer suggests this is enough [3] but the main
> documentation [4] suggests we need to include a chunk of RDF as an
> xsd:annotation.
> 
> And given that the normative transform is defined in a human readable
> document, not an XSLT, is this going to break something? Actually, we do
> have an XSLT but a) it's not normative and b) it handles some, but not
> all of the transform (see the thread starting at [5] if you care why).
> 
> Any and all comments gratefully received.
> 
> Thanks
> 
> Phil.
> 
> [1] http://www.w3.org/TR/2008/WD-powder-formal-20080815/
> [2] http://www.w3.org/2007/05/powder/wdr.xsd
> [3] http://www.w3.org/TR/grddl-primer/#spreadsheets-section
> [4] http://www.w3.org/TR/grddl/#ns-bind
> [5]
> http://lists.w3.org/Archives/Public/public-powderwg/2008Sep/0034.html
> 
> --
> Phil Archer
> w. http://www.fosi.org/people/philarcher/
>

Received on Wednesday, 15 October 2008 15:20:20 UTC