Postfix LDAP schema

["matthew sporleder" <msporleder%gmail.com@localhost>]

I'm seeking some standards for postfix and ldap.  Postfix doesn't
provide a schema and, instead, provides a free mapping mechanism.  So
far I've found mention of people using the sendmail schema, the
courier schema, and this:
http://ldapadmin.sourceforge.net/docs/postfix.schema .

If you're already using ldap for postfix (aliases, etc), please give
me some direction.

Thanks,
Matt