AuthzSVNAccessFile and [alias]

[Esmond Pitt]

The value of an alias in the AuthzSVNAccess file seems constrained to be
whatever login name the user used.
 
However I am using LDAP authentication, and it is preferable for me for it
to be the full DN of the user rather than whatever he supplied as the login
name.
 
I have 'AuthLDAPRemoteUserIsDN on', which promotes this behaviour for the
REMOTE_USER variable within Apache.
 
Is there a way of propagating that behaviour to the AuthzSVNAccess file?
 
Thanks in advance
 
EJP