You're right. XML is about 25% of the code (~3M of ~12M lines, ignoring blank lines). And overall, some 20% of the project is comments (~3M comments of ~15M lines code + comment, again ignoring blank lines). And in spite of that, they appear to have several small things with no comments whatsoever. Most of the other stuff is about what you'd expect, though: the header files and assembly have the most comments, while the one-off programs have very few.

Still, I wonder what they used Lisp for? Or why they used so many different tools? I mean, Perl was all but made to replace awk & sed. Did they have several people who did little one-off tasks in their favorite language when they were pressed for time?

Must be nice to get the tools you want, though, instead of being subject to absurd decisions by superiors (think "Daily WTF material").