Hints for an extension

[Kaspar Giger]

Hi all,
because I didn't know where else I should pose my question, I ask you:
I want to extend the Bash with an XPath-like syntax to select files 
efficiently. I already wrote such a library and want to integrate it in 
the Bash. So can you give me some tips where to start within the 
Bash-source code? I know, I have to somehow change the 
globbing-functionality in glob.c. But at that point the Bash already 
changed the entries of the word_list and that shouldn't be done in my 
case. Or would you disadvise to use the Bash for such experiments?
Thanks
kaspar