Naive question: boolean dependency

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

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