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   Re: [xml-dev] Is this constraint expressible in XML Schema?

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Kenneth Stephen wrote:
 >     I want to express the following constraint using XML schema :
 >     An unbounded sequence of (A or B) elements which can contain at
 > most n instances of A.
 >     To illiustrate, I set n = 2. In that case, BABBBBBABBB is valid.
 > So is AABB .  BABABA is not valid because there are more than 2 A
 > elements in it.

No can do. Try Schematron.



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