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   Re: [xml-dev] How can I constrain publicly available schemas?

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It was only scary because I didn't think anybody else would be doing it 
that way and I'll probably have to refactor some other schemas to make 
it easier to do this, otherwise it sounds like a good approach.

How do you handle versioning  in that case? Or, rather, how do you 
decide when you have created a new version of a schema? Does it make 
sense to ask that??

 > The key is that we have a formal means of

> annotating the relationship between the master and the derived.

I'd be interested to know a bit more about this as I could see it being 
useful for my company's client.

Many thanks for providing such a clear and concise answer.



Uche Ogbuji wrote:

>On Mon, 2005-04-04 at 11:53 +1200, Fraser Crichton wrote:
>>Thanks for getting back so quickly. Maybe I should clarify - 
>>The people submitting documents to my system are free to create
>>documents as they wish so long as they validate against xCIL, so they
>>can create a document with OrganisationInfo elements but my system can
>>only deal with documents with PersonInfo elements. As far as my system
>>is concerned the xCIL schema hasn't constrained the document
>>So do I use business logic code to validate against this situation or
>>do I create a more constrained schema in the same namespace (a scary
>Why is that scary?
>In a current client project, involving a large diversity of documents
>form a diversity of sources, we use this basic pattern.  We have a
>master schema (like xCIL in your case) and a derived schema (like your
>more constrained version).  The key is that we have a formal means of
>annotating the relationship between the master and the derived.  In this
>way we can design our processing pipeline to deal with whatever
>constraints are appropriate at any stage.  As long as people follow the
>business rule that the universe of valid documents for any derived
>schema is a subset of the universe of valid documents for the
>corresponding master schema, it all works very well indeed.  The problem
>is that code review is the only way we have to enforce this rule.  There
>have been discussions of schema algebra on this list that might allow
>for automated proofs, but I've never been able to boil the theories down
>to running code, even though we use RELAX NG language in our project
>(RELAX NG has the advantage of very clean semantics).

Fraser Crichton
XML Developer
SolNet Solutions Limited
L12, SolNet House, 70 The Terrace
PO Box 397, Wellington, Aotearoa / New Zealand
www.solnetsolutions.co.nz <http://www.solnetsolutions.co.nz>
DDI: 04-462-5078
Mob: 027-278-3392
Fax: 04-462-5011
email: fraser.crichton@solnetsolutions.co.nz 

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