Uniform Resource Name

A [URI]--that is, a string--which '''names''' a resource. [URL]s in contrast
tell us where to find a resource, i.e. its location.  RFC 2141 has the URN
of "urn:ietf:RFC:2141", and the URL "http://www.ietf.org/rfc2141.txt".  It's this RFC, incidentally, which defines URNs.
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