Failed dependency upgrading PHP

[mdafforn]

I am trying to upgrade PHP from 4.3.9 to 5.2 using the ART repository (from everything I've read it's supposed to be easy, just do it), but it's failing on a dependency.

When I try to do a 'yum upgrade php', I get:

-> Processing Dependency: php-common = 5.2.12-1.el4.art for package: php-xml
--> Finished Dependency Resolution
Error: Missing Dependency: php-common = 5.2.12-1.el4.art is needed by package php-xml

Anyone know how to cure this dependency?

Anyone know what uses php-xml? I removed the other stuff that sitebuilder used, and was wondering if this was one last thing.

Thanks!