Suggestions for good expression tutorial/guide/reference?

I just spent 3 hours writing a simple XPath expression (at least I think it's an XPath expression). I kept making simple mistakes due to my lack of understanding of some of the internal workings of expressions in Oracle's BPEL tools. Little things, like the difference between bpws:getVariableData('corePerson','/ns6:Person/ns6:globalId') and $corePerson/ns6:globalId, kept tripping me up. While these are both valid expressions that compile and deploy perfectly fine, they do very different things... and I needed to use one in one place in my BPEL process and the other in another place in the same process.
Does anyone have any recommendations for good tutorial and reference material for working with XPath expressions? I'd love something that describes, in depth, all of the standard (and Oracle-specific) XPath functions... what they do and when/how to use them. Also, it would be great to get a better understanding of different types of expressions and where I might want to use each one (such as the example given above).
Thanks!
-Nathan

Hi, I read a lot books, blogs, post at Adobe Dev website.
But I found one fun way to begin: Lynda.com http://tinyurl.com/3yl6xqt
Try it are some free videos.
Good luck

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"Darrel" <[email protected]> wrote in message
news:etjl7b$3qt$[email protected]..
> I'm in need of a rather specific UI implementation and
I've found plenty
> of AJAX libraries that ALMOST give me what I want out of
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> nothing that exactly matches. I need to find out which
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> best suited to modifications to do what I need and have
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> start. Can anyone suggest a relatively active AJAX
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> found a handful of forums, but none that are actually
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myself). Library specific forums are usually very good
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Suggestions for good expression tutorial/guide/reference?

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