Re: Choice of transformation language?

Thanks for the answer, Dan.

I.

Dan Connolly wrote:
> On Thu, 2006-10-26 at 11:02 +0200, Ivan Herman wrote:
> 
>>Maybe an editorial comment only.
>>
>>Section 6 is a little bit vague, to my taste, as to whether GRDDL
>>*requires* the transformation to be XSLT or XSLT2 or not.
>>
>>If the intention is to require it, than this should be formulated
>>clearly (the transformation MUST be XSLT or XSLT2).
> 
> 
> The intention is not to require it, but indeed to allow
> a choice of transformation language.
> 
> This was identified as issue whichlangs and resolved 30 August.
> http://www.w3.org/TR/2006/WD-grddl-20061024/#issue-whichlangs
> 
> 
> 
>>If there is no such requirement (and the second paragraph of the section
>>seems to suggest that), then there is a technical question: how does a
>>GRDDL implementation know what transformation engine should be used?
> 
> 
> By the normal mechanisms of web architecture; MIME types, for example.
> 
> In section 2 of the GRDDL spec, we have...
> 
> [[
> An XML document whose root element has an attribute with a local name of
> transformation and a namespace name of
> http://www.w3.org/2003/g/data-view# has a GRDDL transformation for each
> resource identified by a URI reference listed in the value of the
> attribute (c.f. section 4.4.1. URI references in [WEBARCH]).
> ]]
>  -- http://www.w3.org/TR/2006/WD-grddl-20061024/#grddl-xml
> 
> and if you follow that link and read about URI references
> and URIs, you eventually get to...
> 
> [[
>  8. The agent interprets the returned representation according to the
> data format specification that corresponds to the representation's
> Internet Media Type 
> ]]
>  -- http://www.w3.org/TR/2004/REC-webarch-20041215/#uri-dereference
> 
> 
>> Is
>>there a need for another attribute/element specifying this (although I
>>would not know how exactly...)?
> 
> 
> When a GRDDL implementation is fetching the transformation, it
> may use the HTTP Accept: header to specify the transformation
> formats it prefers/accepts. I have an action to add an appendix
> to show some details like this in a sample implementation.
> 
> We intend to develop test cases to demonstrate how transformation
> languages other than XSLT may be used. We have an XProc example
> in progress, for one.
> 

-- 

Ivan Herman, W3C Semantic Web Activity Lead
URL: http://www.w3.org/People/Ivan/
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