help understanding xslt processing model

HI,

I have quite a bit of programming experience but after using xslt forr
about a month (using web and oreilly book mostly), I still am all too
often befuddled as to why my output is a certain way and not another :(

I can attribute allmost all my errors to a lack of understanding of how
the xslt processor is walking through the style sheet/input document
and applying my rules and the default rules.

Could anyone perhaps point me to any good reference martial on understandin
g the model more in depth?

I really wish I could just see it in pseudo code; with the default
template logic too. Just because that's the sort of thing I
understand fairly readily, it shows the logic. foreach this do
this, while this etc.

I'm using mostly libxslt on linux to transform xml to html. I've tried
a few debuggers to see the walking through of the stylesheet as it
happens, but the linux debuggers aren't very good and often can't make
it through the sheet heh.

any help appreciated!
thanks, Jone