# Re: Persistent Documents and Locations

Keith Moore (moore@cs.utk.edu)
Mon, 21 Aug 1995 20:19:19 -0400

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    Message-Id: <199508220019.UAA04322@wilma.cs.utk.edu>

    From: Keith Moore <moore@cs.utk.edu>

    To: "Karen R. Sollins" <sollins@lcs.mit.edu>

    Subject: Re: Persistent Documents and Locations

    In-Reply-To: Your message of "Mon, 21 Aug 1995 11:21:18 EDT."

                 <199508211521.LAA09705@lysithea.lcs.mit.edu>

    Date: Mon, 21 Aug 1995 20:19:19 -0400

> Perhaps I'm misunderstanding something, but it seems to me that
> dangling references (whether they are URNs or URLs or anything else)
> will always have validity in some cases. If I let out a reference to
> something for which I have sole responsibility and that I intend to
> keep that way, then I have the option of causing that thing to be no
> longer available. Et voila! the potential for dangling references.

Good point.

Part of the problem with the current URL situation is that a user
cannot tell whether a reference is dangling because the file has been
"revoked" or whether it has simply moved to another location. (either
because the file has moved on the same server or because the server
has a new name).

Another part of the problem is that there's no way for an author to
say "I expect to maintain this reference for a long time". People and
robots copy references to documents without really considering whether
the reference is likely to be stable.

Keith

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