Didn't Georgia Tech produce some sort of schema subtype building/verifying 
tool for the GJXDM monster?  Is it publicly available for use or 
cannibalization?

Cheers Jack

>From: Webb Roberts <webb.roberts@g...>
>To: Boris Kolpackov <boris@c...>
>CC: Andy Den Tandt <andydt@e...>, <xmlschema-dev@w...>
>Subject: Re: Maintaining a subset of a schema
>Date: Fri, 3 Aug 2007 10:28:53 -0400
>
>
>Boris Kolpackov wrote:
>>I don't think there is a way to achieve what you want without
>>syntactic changes to your XML documents except for maintaining
>>two separate schemas (perhaps you can factor out and reuse some
>>common types that are the same for both vocabularies). Or maybe
>>you could use the redefine construct (I personally prefer to
>>stay away from that beast).
>
>I've found that it is pretty straightforward to create a subset schema set 
>with a little XSLT.  Copy most things, and tweak or remove certain 
>constructs.  It's one more thing to maintain, but it works quite well. You 
>can write them from a "what to remove" perspective, or from a "what to 
>keep" perspective, depending upon your needs.
>
>>If you are willing to change your XML vocabulary then you can
>>can use XML Schema polymorphism (either xsi:type or substitution
>>groups). You would define a base type for the 'b' element (say,
>>b_base_t) which does not contain the 'v' attribute. Then you would
>>define b_t by adding the 'v' attribute to b_base_t. Using the
>>xsi:type approach your first XML document would look like this:
>
>The problem with this approach is that the resultant schema does not 
>require the substitution be made.  The substituted elements are additional 
>options provided by the schema set.
>
>If you're willing to rewrite your instances, element substitution can be 
>enforced through complex type restriction, but enforcing such constraints 
>propagates through the schema set.
>
>An additional option is to create substitutable components, and transform 
>the original schema such that the base components are made abstract, which 
>means you _have_ to do _some_ substitution.
>
>Good luck,
>Webb
>
>--
>Webb Roberts
>Georgia Tech Research Institute
>

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From Adam.Fortuno@M... Thu Aug 09 15:04:56 2007
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