Looks like XMLElement is getting deep changes, and the official doc isn't updated yet. Or is it Processing itself?
Well, I extracted XMLElement.class and used jad to get a decompiled class. And I cannot find getInt nor getString, which is confirmed by the syntax highlighting of PDE.
But we have getIntAttribute() and getStringAttribute() which is more verbose but clearer, IMHO.
Mmm, but if I replace them, I get "cannot convert from XMLElement to XMLElement" error on the 'kid' extraction, which is quite confusing!
And I just got the latest source (a long operation because the trunk is "polluted" by lot of .class files, strange...) and the getXxxAttribute() functions are marked as deprecated. Strange.
As I wrote, this class is quite in flux!

OK, I cut the code that was still in the PDE (unsaved), I ran once with the empty PDE, I then pasted back the code, ran it, and it worked! Black magic...

Does anyone know if a ticket was put in for this and what the status is?  I ran into this problem today.

I just found the bug 304 where Fry confirms that getXxxElement() methods are deprecated in favor of getXxx(), so the doc. is, for once, more in advance than the code... Which is confirmed by bug 382.

Actually, after getting the latest SVN update, I see these getInt() and other functions.
And I just tried using it, with 0191 (I suppose I was on 1.2.1 when I wrote the answer above), and getInt() just works (and is highlighted).

You can use getIntAttribute() and getStringAttribute().