Naive question: boolean dependency

[devzero2000 <pinto elia gmail com>]

Hi to all

I have not found recent documentation, so this post.

It is  possible to express boolean dependencies in RPM?


For example i would like to say that a package  depends on if another package is not installaed. 
Or if could express OR dependency, eventually based also on version number : e.g. 
as in Requires: (pkg <=1.0.3) | (pkg>=1.9.3) 


Thanks in advance