32 bit versus 64 apt-get/reprepro dependency switchover?

[Ignacio Valdes <ivaldes@hal-pc.org>]

Hi, so where is the logical switchover specified for reprepro/apt-get
on 32 bit versus 64 bit packages? In other words I have package
x-32.deb and package x-64.deb, they need to be installed
differentially based upon 32 vs 64 bit architecture. Does this
specification occur in reprepro conf files? If so, how?

-- IV