Question regarding domain name in a web URL

[darshan.karandikar at tcs.com]

Hi,

I have one question regarding domain
name in a web URL. (I am a newcomer to this discussion forum and this is
my first post, so please excuse me if this is not the correct question
to be asked on this forum, and kindly guide me to the correct forum).

Is "www.my.domain.again.my.domain.com"
a valid URL on INTERNET?
I know that "http://my.domain.again.my.domain.com"
can be a valid INTERNET DNS address, but not sure about something like
"http://www.my.domain.again.my.domain.com" (NOTE THE "www"-
Does "www" has any significance in this URL when it comes to
DNS name resolution?).

I couldn't find any document or forum
which clearly rules out something like the above URL as an invalid one
OR not as per IETF (or any other relevent) specs.
Just wanted to check if something like
"www.my.domain.again.my.domain.com" can be published on INTERNET
DNS as valid site URL or not? If the answer is "no", please specify
the reason or point me to relevent documentation/specification.

Thanks for your time.

Regards,
Darshan

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