I try to remove xfce4-doc, since I don't need it. Here's the result:

# yum erase xfce4-doc
Loaded plugins: langpacks, presto, refresh-packagekit
Setting up Remove Process
Resolving Dependencies
--> Running transaction check
---> Package xfce4-doc.noarch 0:4.8.1-2.fc15 will be erased
--> Processing Dependency: xfce4-doc for package: xfce-utils-4.8.1-2.fc15.i686
--> Processing Dependency: xfce4-doc for package:
xfce4-power-manager-1.0.3-1.fc15.i686
--> Processing Dependency: xfce4-doc for package: xfce4-panel-4.8.3-2.fc15.i686
--> Processing Dependency: xfce4-doc for package: xfdesktop-4.8.2-1.fc15.i686
...
Dependencies Resolved

=========================
 Package
=========================
Removing:
 xfce4-doc
Removing for dependencies:
 Thunar
 thunar-archive-plugin
 thunar-volman
 xfce-utils
 xfce4-mixer
 xfce4-panel
 xfce4-power-manager
 xfce4-session
 xfce4-session-engines
 xfce4-xkb-plugin
 xfdesktop
Transaction Summary
=========================
Remove       13 Package(s)

Installed size: 31 M
Is this ok [y/N]:


I think this is wrong. Instead of requiring xfce4-doc, these packages should
simply fail gracefully when help or doc files they try to display are not
found.