version numbering vor beta releases

[martin@internet-treff.uni-koeln.de (Martin Bialasinski)]

Hi,

I want to make a programm version 2.0, but I want to release some
betas before this. What version scheme should I use for the betas, so
that dpkg recognises the 2.0 release to be newer than the betas?

Ciao,
	Martin