SSL Client solved, but new question

Hello again,

I solved my initial problem regarding client authentication for specific
networks by setting up a new site. Client authentication is working well
here.

My new question is: Can I pass the authentication information (e.g. Client
certificate's CN) to other apache modules, like dav_svn to authorize the
client? Could be used as an alternative to password-based logins for
subversion.

Best regards,
Erhard