# Re: No "TOP" of the docuverse [Was: URC usage scenarios ]

Larry Masinter (masinter@parc.xerox.com)
Thu, 6 Oct 1994 23:54:24 PDT

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    To: rtor@ansa.co.uk

    In-Reply-To: rtor@ansa.co.uk's message of Wed, 5 Oct 1994 10:07:27 -0700 <94Oct5.100739pdt.2760@golden.parc.xerox.com>

    Subject: Re: No "TOP" of the docuverse [Was: URC usage scenarios ]

    From: Larry Masinter <masinter@parc.xerox.com>

    Message-Id: <94Oct6.235436pdt.2760@golden.parc.xerox.com>

    Date: 	Thu, 6 Oct 1994 23:54:24 PDT

Most discussions about URNs seem to also leave out another important
constraint: that URNs have a longer lifetime than the publisher/host
that originated them. I think it's important that the Name->Address
resolution system allow for the possibility that institutions
disappear as well as split, merge, spin of sub-components.

Systems that are based on looking up the DNS of the 'original
publishing host' will fail because most DNS names disappear or get
reassigned over time.

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