<World-Wide Web> (URN, previously Uniform/Universal Resource
Number) 1. Any URI which is not a URL.
2. A particular scheme which is currently (1991-4) under
development by the IETF, which should provide for the
resolution using Internet protocols of names which have a
greater persistence than that currently associated with
Internet host names or organisations (as used in URLs).
Uniform Resource Names will be URI schemes that improve on
URLs in reliability over time, including authenticity,
replication, and high availability.
When defined, a URN in sense 1 will be an example of a URN in
sense 2.
