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Re: [XTAN] A limited extensibility mechanism (but extensible)

From: Gary Hallmark <gary.hallmark@oracle.com>
Date: Mon, 09 Feb 2009 16:54:26 -0800
Message-ID: <4990D042.1050406@oracle.com>
To: Christian de Sainte Marie <csma@ilog.fr>
CC: RIF WG <public-rif-wg@w3.org>

1. your xslt would transform Do(Retract(?x)) to And(Retract(?x)) -- not 
legal Core
2. your xslt would transform Do(Assert(eg:P(?x))) to And(eg:P(?x))  -- 
not legal Core either, but could easily be added I guess
3. I have no idea how this helps resolve object VS frame

Christian de Sainte Marie wrote:
> All,
>
> Trying to find a resolution to the "object VS frame" discussion, that 
> would reconcile the requirement for maximal interoperability between 
> PRD and Core, and the demand for dialect-specific idioms (as part of 
> the requirement for easy implementability and wide adoptability), I 
> came back to exploring the feasibility of some kind of simple 
> extensibility mechanism...
>
> And I came to two conclusions:
> - There is a quite simple solution, using XSLT, that enables a form of 
> limited forward compatibility between extended and extending dialects;
> - Such a mechanism is desirable even if we do not add new specific 
> syntax to what PRD already has (for several reasons, but one, with 
> which  I expect everybody will agree, is scalability).
>
> I wrote a strawman proposal [1], with a couple examples, and I tried a 
> complete, if simple, example to check feasibility. You will find 
> attached:
> - a file called PRDex.xml, that contains a PRD-fied version of the 
> complete example in BLD;
> - a file called COREex.xml, that contains a COREified version of the 
> same;
> - a file called do2and.xsl, that contains the XSLT stylesheet that I 
> used to produce COREex.xml from PRDex.xml (I tested it with msxsl and 
> saxon9).
>
> [1] http://www.w3.org/2005/rules/wiki/Limited_Forward_Compatibility
>
> What makes me believe that the solution I propose is simple, is that I 
> did not know anything about XSLT only 10 days ago, and I believe, now, 
> that I could write, in a matter of days, the complete XSLT stylesheet 
> for all the fallbacks needed to provide limited forward compatibility 
> to Core wrt PRD as it stands today (and some more :-)
>
> Does this make sense?
>
> Cheers,
>
> Christian
>
Received on Tuesday, 10 February 2009 00:56:11 GMT

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