Universal Resource Identifiers in WWW
Informational memo, RFC1630. Internet Engineering Task Force, (June 1994)Abstract
This document defines the syntax used by the World-Wide Web
initiative to encode the names and addresses of objects on the
Internet. The web is considered to include objects accessed using an
extendable number of protocols, existing, invented for the web
itself, or to be invented in the future. Access instructions for an
individual object under a given protocol are encoded into forms of
address string. Other protocols allow the use of object names of
various forms. In order to abstract the idea of a generic object,
the web needs the concepts of the universal set of objects, and of
the universal set of names or addresses of objects.
A Universal Resource Identifier (URI) is a member of this universal
set of names in registered name spaces and addresses referring to
registered protocols or name spaces. A Uniform Resource Locator
(URL), defined elsewhere, is a form of URI which expresses an address
which maps onto an access algorithm using network protocols. Existing
URI schemes which correspond to the (still mutating) concept of IETF
URLs are listed here. The Uniform Resource Name (URN) debate attempts
to define a name space (and presumably resolution protocols) for
persistent object names. This area is not addressed by this document,
which is written in order to document existing practice and provide a
reference point for URL and URN discussions.
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