[Dovecot] LDAP schema for mailLocation?

Hi,

I would like to try implementing user specific default_mail_env's as described here:

http://wiki.dovecot.org/moin.cgi/MailLocation

using the LDAP attribute 'mailLocation'.

However, I have been unable to find any LDAP schema which contains mailLocation. What schema is this attribute part of?

Thanks, Jason Pepas