[xslt] Import/Include of Stylesheets

[David Hyatt <hyatt apple com>]

I am pretty confused now.  I hooked up my own code to walk the DOM of a 
root stylesheet and to kick off loads of the child stylesheets.  I get 
all of the documents parsed into xmlDocPtrs.  What I found was that 
when I then called xsltParseStylesheetDoc, it didn't even try to do 
I/O, and it actually used the child documents I had loaded myself!

Does libxml actually have a global document cache?  That's the only 
explanation I could come up with for why this would work.  Do I even 
need the new docloader API?

dave