DOM validation using Java is extremely slow

I have a large XML file ~8MB. When I do validation on it using java api, takes ~5 hours to process it.
I have narrowed down the problem to xs:unique rules in the schema file. When I remove these rules, validation takes ~1 min.
I have tried using MSXML parser with unique rules and it take about 30 min.
My question is how could I speed up the validation in Java with these unique rules in the schema.
Any help will be greatly appreciated.
Thanks.

Basically, you are saying removing the unique elements
from schema and do the checking myself. This means
everytime the schema is updated with new unique rules,
I will have to modify the code to check for unique
elements.
Is there any other way to tackle this problem?You can choose what processing is done with the XML parser, and what is done within java, if you control the schema. Uniqueness is one that I have preferred to perform in java, since I often perform other validations in java anyway, and it works well. Just my opinion.
If you post some XML/XSD code and list the parser you are using, someone that uses xs:unique may find something they can help you with.
-Scott

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