Xen 3.0.2 in Dom0 64bit & DomU 32bit Guest-OS?

[Master One]

I am interested in trying out Xen on a server with Xeon EM64T processor, and I was wondering, if it makes any sense to install a 64bit Gentoo with Xen in Dom0.

Is it possible, to run 32bit DomU installations, if Dom0 is 64bit?

I already searched for more info, but all I found were some older statements, which tell that this is not possible, but this info may already be deprecated.
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