How to constraint one attribute according to another?

Hi,
I have an element which has two attribute A and B. A's value can be 'a' or 'b', if the value of 'a', B's value should be 'b1' or 'b2', else, B's value should be 'b3' or 'b4'.
How to express this contraintion in xsd?
Thanks, Robin

This type of validations come under the "rule-based" validation domain. Hence cannot be accomplished with XSD Schema.
There are two different flavors for an xml schema language:
-- Grammar based. (e.g. XSD Schema; DTD...)
-- Rule based. (Schematron)
A rule-based schema language specifies the relationships that must hold between the elements and attributes in an XML instance document. [as is the case here]
Schematron is one of the types of rule-based schema languages.
For more details on types of schema languages: http://www.xfront.com/schematron/Two-types-of-XML-Schema-Language.html
Schematron Introduction:
http://www.xml.com/pub/a/2003/11/12/schematron.html
regards,
Asheesh Ambardar

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Message was edited by: Siegfried Szameitat

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Message was edited by: Siegfried Szameitat

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Note : Please award points if this helps you.
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