One of the things on my to do list is to make an attempt to use XSLT to 
"preprocess" a lot of the nastier stuff (import, include, equivClass's, type 
inheritance) out of an XML Schema, just leaving the
fundamental information that a validator needs (the normalized XML Schema).  I 
don't know how far I can go with that, but if it goes well and is useful, I 
could see donating to Apache.

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