# Re: DNS lookups for URLs (was: URN functionality from URLs)

Larry Masinter (masinter@parc.xerox.com)
Wed, 15 Dec 1993 00:38:17 PST

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    To: dupuy@smarts.com

    In-Reply-To: dupuy@smarts.com's message of Tue, 14 Dec 1993 21:24:21 -0800 <93Dec14.212422pst.2735@golden.parc.xerox.com>

    Subject: Re: DNS lookups for URLs (was: URN functionality from URLs)

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

    Message-Id: <93Dec15.003823pst.2732@golden.parc.xerox.com>

    Date: 	Wed, 15 Dec 1993 00:38:17 PST

> The purpose of putting in local DNS IX records for STANF URLs in other domains
> is to provide caches for the files (objects) referenced by the URLs, not
> caches for the IX records themselves (in that case, a caching nameserver would
> be better). This sort of local cache for common references (RFCs,
> dictionaries, etc.) will be very important, and is one of the reasons for
> URNs, which are supposed to be location-independent.

Currently, we have the situation where some URNs refer to things that
are cachable (they refer to exact copies of bits) and other are not
(they refer to locations that are themselves updatable).

Please please try to separate these out when you're making proposals.
Would you put the updatable resources in the cache?

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