Re: Constraints in XML Schema

Hi Jan,

maybe you can express and validate your constraints using Schematron. If you
do not care about conformance then you can also use JBind (www.jbind.org). I
augmented the XML schemas with an XPath-Constraint facility.

--Stefan


> 
> Hello and merry christmas,
> 
> I have a design problem with XML Schema. I am in the situation that it
> would be very appealing to use something like Constraints (beyond the
> uniqueness-constraints XML Schema offers with Key, Keyref and Unique).
> 
> Therefore, I was wondering whether there are attempts being made to
> integrate a Constraint-Concept into XML Schema (something that we know
from SQL
> in the database area). In my design situation it would be nice to have
> something like Xpath-Constraints. I am thinking of an Xpath-Statement that
must
> evaluate TRUE in order to validate an instance document against that XML
> Schema. With such a mechanism it would be easy to build structures and
allow
> only certain content constellations. 
> 
> By now, I will probably fix my problem by defining a bunch of simple types
> which capture these constraints implicitly with the use of regular
> expressions. A not very elegant solution.
> 
> Any hints on constraints in any schema-language will be appreciated. I am
> looking forward on your commends.
> 
> Best regards, 
> Jan Mendling
> 
>
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Received on Monday, 30 December 2002 10:52:39 UTC