public void setPosixMode(boolean posixMode) {
        this.posixMode = posixMode;
        properties.put("ldap.posixMode", String.valueOf(posixMode));
    }
Sets whether the LDAP server is operating in Posix mode. When in Posix mode,
users are stored within a group by their username alone. When not enabled,
users are stored in a group using their entire DN.

@param posixMode true if posix mode is being used by the LDAP server.
xmppserver/src/main/java/org/jivesoftware/openfire/ldap/LdapManager.java