[Dovecot] Dovecot dict and quota

[mikael]

Hello,

I try to understand the dict configuration for quota. In 
http://wiki.dovecot.org/Quota/Dict, i read :

====

Example dovecot-dict-quota.conf:

   connect = host=localhost dbname=mails user=mailuser
   table = quota
   select_field = current
   where_field = path
   username_field = username

Create the table like this:

   create table quota (
     path varchar(255) not null primary key,
     username varchar(255) not null,
     current integer
   );

====

What is "path" ? which is the utility of this field for quota ?

Thanks for your help,
-- 
Mikaël PIRIO
4 Square de Massouah - 35000 RENNES
Tel : 02 99 30 49 98 - 06 63 34 03 02