Perhaps the missing quote marks around the ACL name?
This works for me:
acl "internal-xfer" {
10.0.0.93;
10.0.0.94;
};
acl "trusted" {
10.0.0.0/8;
localhost;
};
zone "somedomain.com" in {
type master;
file "master/db.somedomain.com";
allow-query { trusted; };
allow-transfer { internal-xfer; };
};
dn