5.1.6.2. Structure Overview 
The node numbers have a hierarchical structure. A network can have
up to 3 levels , therefore the node numbers have up to to 3 levels. The
representation at the AMO-Interface is (except with AMO KNMAT)
aa-bbb-ccc, where
aa = Level 2 (Domain) Area number (0-29)
bbb = Level 1 (Subdomain) Area number (0-253)
ccc = Level 0 (Node) Node number (0-999)
A multi level node number is regarded as unique if it is different in at least one
level of the
other node numbers. The node number 0 in lower levels means "any" (e.g. 2-0-0). High-order
zeros can be left out (e.g. 0-0-2 = 2).