Génère un événement DROP_PATH pour supprimer le chemin de pa_server à pa_client.

declare
        p_pa_server             alias for $1;
        p_pa_client             alias for $2;
        v_row                   record;
begin
        -- ----
        -- Grab the central configuration lock
        -- ----
        lock table sl_config_lock;

        -- ----
        -- There should be no existing subscriptions. Auto unsubscribing
        -- is considered too dangerous. 
        -- ----
        for v_row in select sub_set, sub_provider, sub_receiver
                        from sl_subscribe
                        where sub_provider = p_pa_server
                        and sub_receiver = p_pa_client
        loop
                raise exception 
                        'Slony-I: Path cannot be dropped, subscription of set % needs it',
                        v_row.sub_set;
        end loop;

        -- ----
        -- Drop all sl_listen entries that depend on this path
        -- ----
        for v_row in select li_origin, li_provider, li_receiver
                        from sl_listen
                        where li_provider = p_pa_server
                        and li_receiver = p_pa_client
        loop
                perform dropListen(
                                v_row.li_origin, v_row.li_provider, v_row.li_receiver);
        end loop;

        -- ----
        -- Now drop the path and create the event
        -- ----
        perform dropPath_int(p_pa_server, p_pa_client);

        -- Rewrite sl_listen table
        perform RebuildListenEntries();

        return  createEvent ('_schemadoc', 'DROP_PATH',
                        p_pa_server::text, p_pa_client::text);
end;