[ardour-users] external generation of Ardour file -- ids?

[Christopher Bailey]

Hello,

I am writing an application that writes Ardour mix files externally.  I'm 
understanding the xml format pretty well.  One question I have:   where do 
the various IDs come from?  specifically:

Session id-counter
source
Region
Diskstream

Looks like increments of 7, 9, 15 or 20 are happening, but I'm not sure of 
the logic behind that.

Thanks,
Christopher Bailey