forward only for a delegate domain

[Jean-Michel Doublet]

Hi,

mydomain is u-paris10.fr.  SOA orphee.u-paris10.fr.

a zone is cep.u-paris10.fr. SOA cep0.cep.u-paris10.Fr.

i want that my server orphee don't answer to the query for cep.

How do i proceed ?

when i do

zone "cep.u-paris10.fr" {
    type forward;
    forward only;
    forwarders {
        1.2.3.4;
    };
};

i've got a syntax error.