file externals & URLs

Hi,

I read in the svn-book that file externals are supported only in the
same repository. But it is not clear in my repositories architecture :

My repositories are accessed through Apache and all use the same FQDN/vhost.

                                                 FQDN/repo1
FQDN/repo2
                                                                \
                  |
                                                                  \
                  |
                                                                   \
                 /
                                                                     
\ /
                                                                       
\ /
                                                               VHOST (FQDN)
                                                                             |
                                                                             |
                                                                            / \
                                                                          / \
                                                                        
/ \
                                                                       
| |
                                                                       
| |
                                                                 
repo1 repo2

Is it still not possible to use file externals pointing on different
repositories ?
According to the documentation I think it is not possible, but I prefer
ask for confirmation.

-- 
Bastien Semene
Administrateur Réseau&  Système
Cyanide Studio - FRANCE