presenting the fundamental abstractions

[Andrew King]

Thanks for the reply, I understand you are short on time, but can you
give me a bit more explanation on how a revision is a state, not a
change?

Does that mean that the revision internally stores a file? I assumed
it stored a set of "patches", and possibly the latest version of a
file. Why does it need a parent?

I think once I get this, I will get my head around it ...

Cheers,
Andrew.