Description of problem:
the php53 package from RHEL 5.8 does not provide php so the following line:
  Requires: php >= 4.2.0
means php-pear-XML-Parser cannot be installed with the php53 packages installed.

Version-Release number of selected component (if applicable):
1.2.8-1.el5

How reproducible:
100%

Steps to Reproduce:
1. install php53 packages
2. try to install php-pear-XML-Parser
3. see failure

Actual results:
$ rpm -qa php53\* --pipe="LANG=C sort"
php53-5.3.3-5.el5
php53-cli-5.3.3-5.el5
php53-common-5.3.3-5.el5
php53-devel-5.3.3-5.el5
php53-mcrypt-5.3.3-1.el5
php53-mysql-5.3.3-5.el5
php53-pdo-5.3.3-5.el5
php53-xml-5.3.3-5.el5
$ sudo yum install php-pear-XML-Parser
Loaded plugins: downloadonly, fastestmirror, priorities
Loading mirror speeds from cached hostfile
 * base: mirrors.gigenet.com
 * epel: ftp.osuosl.org
 * extras: mirrors.gigenet.com
 * updates: mirror.us.leaseweb.net
base                                                     | 1.1 kB     00:00
epel                                                     | 3.4 kB     00:00
extras                                                   | 2.1 kB     00:00      
updates                                                  | 1.9 kB     00:00
245 packages excluded due to repository priority protections
Setting up Install Process
Resolving Dependencies
--> Running transaction check
---> Package php-pear-XML-Parser.noarch 0:1.2.8-1.el5 set to be updated
--> Processing Dependency: php >= 4.2.0 for package: php-pear-XML-Parser
--> Running transaction check
---> Package php.x86_64 0:5.1.6-32.el5 set to be updated
--> Processing Dependency: php-common = 5.1.6-32.el5 for package: php
--> Processing Dependency: php-cli = 5.1.6-32.el5 for package: php
--> Running transaction check
---> Package php-cli.x86_64 0:5.1.6-32.el5 set to be updated
---> Package php-common.x86_64 0:5.1.6-32.el5 set to be updated
--> Processing Conflict: php53-common conflicts php-common
--> Finished Dependency Resolution
php53-common-5.3.3-5.el5.x86_64 from installed has depsolving problems
  --> php53-common conflicts with php-common
Error: php53-common conflicts with php-common
 You could try using --skip-broken to work around the problem
 You could try running: package-cleanup --problems
                        package-cleanup --dupes
                        rpm -Va --nofiles --nodigest

Expected results:
package should install