RHEL 4 xen guest on RHEL 5 ?

[clockwork at sigsys.org]

So I have heard mixed reports. Is it supported yet ? I know when update 5
comes out its supposed to be supported, but I have also heard its supported
right now. Whats the definite answer ? I need apache 2.0 (thanks BEA) so
rhel 4 is the best option (custom compiling doesnt scale or long term
upgrade path very well). Of course if anyone has an easy maintainable way to
get apache 2.0 on rhel 5, that would help as well.

Thanks.