We don't need any schema and dtd at the beginning even if it's a good thing to do

Lionel Debroux (./1) :
the '1 project = 1 compilation of a given program' mantra is horrendous when there are MANY programs (ExtGraph: 33 demos + 1 other test program, this number will increase);

No problem we can have project groups and project dependencies
Code::Blocks is my inspiration there

We can also define several targets in project files, that have different compilation options / files

XML is also well supported by Qt so I won't have any problem to use it in the IDE (yes it's sleeping but I'm not leaving it, I want a clear specification before coding ^^)