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Subject: Re: [codelist] Interesting article about extending enumeration listsin XML Schema

I would note that genericode doesn't *require* you to do a two-pass  
validation, you could do a single-pass validation with a SAX-based parser  
that tracked XPaths and checked values as it went through the document.   
The only implementation that we have at present it two-pass, but perhaps  
we need to communicate better that there are multiple options.  Just a  

Cheers, Tony.

On Thu, 25 Sep 2008 05:23:49 +0100, G. Ken Holman  
<gkholman@cranesoftwrights.com> wrote:

> At 2008-09-25 04:05 +0000, kumar.sydney@gmail.com wrote:
>> Came across this interesting article.
> Yes, I also saw reference to this and it was in today's Robin Cover  
> summary.
>> Rules out genericode based approach in the study.
>> http://www.ibm.com/developerworks/library/x-extenum/
> Sure he does ... but from what I read his proposal doesn't address  
> everything that genericode does for deployments such as UBL because of  
> his focus.
> The only genericode lists that are "extended" in UBL are those without  
> definition ... that is to say they are a restriction of an infinite set  
> of all possible values.
> I see using genericode with context/value association allowing different  
> users to have different restrictions on lists without having different  
> schemas.
> Furthermore genericode with context/value association allows different  
> restrictions on the same enumeration used in different contexts of the  
> one document.  I don't believe this can be addressed in W3C Schema when  
> using global types.
> While, yes, you could put value-level meta data and list-level meta data  
> in appinfo constructs in a W3C Schema enumeration, genericode allows one  
> to selectively use the available keys without having to change the file  
> in any way.
> So I don't think his "ruling out" of genericode really affects people  
> considering solutions that need the flexibility not offered by W3C  
> Schema.
> In fact, I think that since the article is *about* extending lists in  
> W3C Schema (based on the title) it makes sense that he cannot talk about  
> genericode.  His observation about genericode that reads "Adding new  
> technology requirements can be too costly or time-consuming in some  
> settings." is, I think too subjective ... if a user's problem is solved  
> by genericode and not by W3C Schema then either they change their  
> requirements or they accept that they need as much software as is needed  
> to solve their problem.  There will be many implementations of  
> genericode and context/value association ... in many contexts such as  
> document data entry or document validation.
> But did you notice the last bullet of the conclusion?
>    "If you want to keep enumerated values out of the parser, consider  
> the Genericode approach"
> Sounds to me like he is affirming genericode's existence and role when  
> users are prepared to do without W3C schema enumerations to get the  
> advantages of genericode and context/value association.
> . . . . . . . . . . Ken
> --
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> G. Ken Holman                 mailto:gkholman@CraneSoftwrights.com
> Crane Softwrights Ltd.          http://www.CraneSoftwrights.com/o/
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Anthony B. Coates
Associate Director
Document Engineering Services (Limited)
UK: +44 (20) 8816 7700, US: +1 (239) 344 7700
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