LDAP with Exim

Hi

I would like to look into adding mail routing handling to LDAP for my 
Exim MTA.

Does anyone know of any links or, even better, is prepared to share 
their schema.

Ive looked at Postfix and Qmails docs, but I would like too a Exim real 
world / working example.

If anyone can help, thank you in advance.

Kind Regards
Brent Clark