class common {
        # variable for this environment
        $domainname = "XXX"
        # puppet fileserver
        $fileserver = "puppet.XXX"
        # proxy in DC
        $proxyserver = "proxy.XXX"
        $proxyport = "8080"

        include staff
        include snmpd
        include sudo
        include puppet
        include ntp
        include dns
        include munin::node

        # selective include, based upon the custom fact 'virtual'
        case $cust_virtual {
                xenu: { include xenU }
                default: { }
        }
}