I found:
Delegation of a further subtree to another set of name
servers is indicated by an soa=delegated attribute.
dom=bignose.cs.research.bell-labs.com
soa=delegated
ns=anna.cs.research.bell-labs.com
ns=dj.cs.research.bell-labs.com
Nameservers within the delegated domain (as in this example)
must have their IP addresses listed elsewhere in ndb files.
which looks mistaken: neither anna nor dj are "within the delegated
domain". I'm not getting the expected results from a delegation of my
own, which need not be an ndb(8) problem at all, but the exact meaning
of the above may help me solve my problem.
++L
