What qualfies a namespace?

[Stephane Bortzmeyer]

On Fri, Oct 20, 2006 at 04:50:27AM -0700,
 April <xiaoxia2005a at yahoo.com> wrote 
 a message of 6 lines which said:

> Without a root, I may call a second level dormain (when there is a
> root) my top domain, is there anything wrong with it?

You may call anything by any name but, if you want to communicate with
other people, in a field whose terminology is already standardized
(RFC 1034), it is better to use this terminology. 

And, in the DNS, a top-level domain is always one label under the
root.