Validating large xml files

In our application we have a requirement to validate large xml file (around 40 mb) against a simple schema file.
I have tried all options(Sax and Dom) mentioned in below article on sun site -
http://java.sun.com/developer/EJTechTips/2005/tt1025.html
but with all of these approches the validation process just hangs for hours.
Even i am running my test case for this validation by allocating 1 GB memory to test case, on latest processor(core-2 duo) but still it just hangs and returns after a long duration.
If needed i can provide sample test case, schema file and xml file.
Please help me to know if its a problem with JAXP 1.3 Schema Validation Framework (SVF) to handle large files, or if there is any other efficient way of validating large xml file.
Regards
Rahul

you may want to split the XML to 10MB each and parse the XML's separately or store in a database and read the XML using XQuery.
I am sure there may be better ways to do this, will see experts opinions here.

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I'll open a TAR and also upload the schema and instance XML.
If i'm not changing the track too much :-) one more thing in continuation:
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Hi Dani,
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