At last I have a role for the web content administration, with apache and selinux, on Fedora Core 2.
Why was it so difficult? Basically because the sample security schemas don't consider the possibility of having a role specifically and exclusively for administering some kind of content (web content in my case).
SELinux is a difficult thing to deal with, because the configuration files are written in m4. My advice, at the present moment, is to carefully read the contents of the