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DNAME semantic checks after zone transfer

The server can accept a transfer leading to a zone containing to following records:

labs.example.com.       IN A       0.0.0.0
labs.example.com.       IN DNAME   rd.example.com.
www.labs.example.com.   IN A       0.0.0.0

This transfer should be refused because there must be no record bellow the DNAME.

The server correctly refuses to load such a zone from a zone file.