Ketil Z Malde ketil at
Thu Jun 24 12:46:49 BST 1999

"Hunter, David" <dhunter at> writes:

> But my questions remain: Is there ever a time when we need/want an
> application to know or think that is the same as

If you're talking about DNS, I would think it could be interesting if
you are doing reverse lookups.

If you're using it as part of an URL, and is much closer to me 
than, but gets updated more often, I might want to
know whether the URLs refer to the same object.

Add a new HTTP request or something that gives you an md5 of the
object.  Embed this in an attribute in links if you want to make sure
you refer to the correct object.  And there is of course no reason for 
a search engine not to incorporate checksums already.

> I have a feeling it's going to be application-specific,

The DNS entries for and could easily refer to the same 
IP address, but have different MX records - or if you prefer, the
document at could be different from that at 

If I haven't seen further, it is by standing in the footprints of giants

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