Section Header
    + name := INPUT;
    - bibliography:="http://IsaacOS.com";
    - author :="Sonntag Benoit (bsonntag@loria.fr)";
    - comment :="Message.";
    - version :=1;
    - date :="2003/04";
Section Inherit
    - parent_inbox:INBOX :=
Section SELF
    + list_client:LINKED_LIST[INBOX];
Section Public
    - is_actif:BOOLEAN;
    - add_client obj:INBOX <-
    - sub_client obj:INBOX <-
    - make <-
    - acknowledge <-