At 03:23 PM 12/22/2002 +0200, Lauri Zoova wrote:

>Extending the phone number example:
>Lauri's phone number = Helen's phone number, if i know that neither of
>us has a phone number. This is the case with null. (IMHO)

Knowing there is no phone is different from not knowing the number.
If I were designing such a system, I'd pick any illegal number
like all zeros, to indicate no phone.


Regards,

Ann
www.ibphoenix.com
We have answers.