XML schema question about conditions

Hi XML wizards,

Is it possible to make elements in an XML schema mandatory depending on the attribute value in a previous element?

For example if an attribute in the root element has value '+' then element <add> is mandatory but element <sub> must not occur in the XML file. However if the attribute has value '-' element <sub> is mandatory but <add> must not occur in the XML file.

Best regards, HKaste

At the moment you can't do this with XML schema alone. You can check that there's only <add> or <sub>, but you can't "prohibit" one or the other. With XML schema 1.1 this will change though.

-Miska-

P.S. For more FAQ's on XML schema check this link out:
http://www.schemavalid.com/faq/xml-schema.html