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Which LDAP schema contains objeclass ldapgroup

Hi,
As listed <a href="http://ftp.uma.es/mirror/postfix/doc/LDAP_README.html" title="http://ftp.uma.es/mirror/postfix/doc/LDAP_README.html">http://ftp.uma.es/mirror/postfix/doc/LDAP_README.html</a> and
mentioned an objeclass
Which Schema contains this objectclass? It's pretty hard to google it, all
are related with bais knowledge of LDAP if I use keyword 'objectclass
ldapgroup' or some pages with postfix LDAP README.

Thanks,