dots in cnames

[beetle bailey]

Say we have a server: hostname.sub.dom.ain and someone wanted to use 
www.hostname.sub.dom.ain (someone created a presentation making use of  that 
address).  Is there any reason I shouldn't create a CNAME for www.hostname 
in the zone file for sub.dom.ain pointing to hostname?  It seems like that 
should be a very bad thing to do, but I tried it and it works.  Then again 
delegating a new subdomain for hostname.sub.dom.ain and adding an entry for 
www sounds like trouble as there's already a A record in sub.dom.ain for 
hostname.sub.dom.ain.  Could I get some input on this?  Thanks.
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