Java EE (Java Enterprise Edition) General Discussion

Hello, I have a search query string like below, it can get more complex, it's in xpath like syntax.
I need to parse it into some kind of tree structure with the operands and values, then I can traverse
that tree and pass the operands into another search engine.


Property contains "abc" and param1 is with value 'val1',
(contains(Property[@param1='val1'], 'abc'))


I have just looked at the java5's XPath module, that doesn't seem to address my needs, it does not
have a low level API that I can compile expression into a tree structure, but mainly for processing XML files.

Does anyone know any freeware that we can use? Does the apache xml module provide some
low level APIs for parsing without an XML file.

Thanks,
-Yu