XP defined?

One of my impressions was that XP is _something_ consisting of  4
values, 12ish practices,  and 15 principles. 

What that something is, I've never really understood.

If I'm understanding things, the new book describes the same XP but
the more I read what you're saying here and on the XP Yahoo forum
the more I realize that I have no idea what "xp" really is. I don't
know if it's a methodology, a philosophy, or what it is. The practices
seem to have changed, as well as the principles, but the _something_, 
whatever it is, is still the same.

So, what is XP? What is that unchanging _something_?





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