nsxml is there so that the aolserver RPMs are ready for OpenACS4.
Troy, I suspect you rebuilt libxml2 but did not install the resulting
binary RPM at all? Look for it in /usr/src/redhat/RPMS/i386/
(unless you have been playing games with the rpm config files on your
machine!) and move
it to the directory with all the other OpenACS-related RPMs in it
before you
do the
rpm -Uvh *rpm