Re: Library Standards and URIs

Dirk Herr-Hoyman (
Thu, 29 Dec 1994 20:11:56 -0500

Date: Thu, 29 Dec 1994 20:11:56 -0500
Message-Id: <ab297012050210040ddc@[]>
From: (Dirk Herr-Hoyman)
Subject: Re: Library Standards and URIs
Cc: "C. M. Sperberg-McQueen" <U35395@UICVM.UIC.EDU>

At 10:21 PM 12/29/94, Terry Allen wrote:
>Larry writes:
>>Just as HTML doesn't require all browsers to implement all of SGML,
>but allows SGML-based tools to be used on HTML documents, we could use
>SGML syntax, but require that a 'URC' be in some canonical form, to
>facilitate easier handling by simpler tools.
>I say again, this won't work if the "canonical form" cannot be
>expressed in a DTD and SGML declaration.  "Using SGML syntax" means just
>that, or it doesn't mean very much at all.  Michael
>Sperberg-McQueen has outlined the desirable SGML toggles for
>achieving simplicity:
>I strongly recommend it.
I would agree that if we are to use an SGML approach, that does mean we
have a DTD.  I think Larry's point is well taken, and does fit with the
proposal of Michael Sperberg-McQueen, which calls for server-side
validation of SGML.  In the same manner, we could require that the URN
resolution server only serve up valid URCs, which have been checked with a
full-blown SGML parser at load time.

I want to also add a side comment to the Sperberg-McQueen paper.  A URC
could be used to associate a DTD and style sheet with an SGML document, as
opposed to doing this with HTTP.  This would make his proposal protocol
independent, or perhaps URN/URC resolution dependent.

Dirk Herr-Hoyman <> |          I tried to contain myself
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