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  • Calvin Chiang thinks this is interesting:

A zone contains all the domain names the domain with the same domain name contains, except for domain names in delegated subdomains. For example, the top-level domain ca (for Canada) has subdomains called ab.ca, on.ca, and qc.ca, for the provinces Alberta, Ontario, and Quebec. Authority for the ab.ca, on.ca, and qc.ca domains may be delegated to nameservers in each province. The domain ca contains all the data in ca plu...

From

Cover of DNS and BIND, 5th Edition

Note

what a sentence!