1. Log into the  linux server and install yum by doing the following;

rpm -ihv --nodeps http://mirror.centos.org/centos-4/4/os/i386/CentOS/RPMS/python-elementtree-1.2.6-5.el4.centos.i386.rpm
rpm -ihv --nodeps http://mirror.centos.org/centos-4/4/os/i386/CentOS/RPMS/python-urlgrabber-2.9.8-2.noarch.rpm
rpm -ihv --nodeps http://mirror.centos.org/centos-4/4/os/i386/CentOS/RPMS/yum-2.4.3-4.el4.centos.noarch.rpm

2.  Add the atomic repo.

rpm -ivh http://www.atomicorp.com/channels/atomic/centos/4/i386/RPMS/atomic-release-1.0-7.el4.art.noarch.rpm
rpm --nodeps -e php-domxml

3. If you want, you can remove yum afterwards;

rpm -e `rpm -aq | grep yum`
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