RFC 2141 (rfc2141) - Page 1 of 8

URN Syntax

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Network Working Group                                           R. Moats
Request for Comments: 2141                                          AT&T
Category: Standards Track                                       May 1997


                               URN Syntax

Status of This Memo

   This document specifies an Internet standards track protocol for the
   Internet community, and requests discussion and suggestions for
   improvements.  Please refer to the current edition of the "Internet
   Official Protocol Standards" (STD 1) for the standardization state
   and status of this protocol.  Distribution of this memo is unlimited.

Abstract

   Uniform Resource Names (URNs) are intended to serve as persistent,
   location-independent, resource identifiers. This document sets
   forward the canonical syntax for URNs.  A discussion of both existing
   legacy and new namespaces and requirements for URN presentation and
   transmission are presented.  Finally, there is a discussion of URN
   equivalence and how to determine it.

1. Introduction

   Uniform Resource Names (URNs) are intended to serve as persistent,
   location-independent, resource identifiers and are designed to make
   it easy to map other namespaces (which share the properties of URNs)
   into URN-space. Therefore, the URN syntax provides a means to encode
   character data in a form that can be sent in existing protocols,
   transcribed on most keyboards, etc.

2. Syntax

   All URNs have the following syntax (phrases enclosed in quotes are
   REQUIRED):

                      ::= "urn:"  ":" 

   where  is the Namespace Identifier, and  is the Namespace
   Specific String.  The leading "urn:" sequence is case-insensitive.
   The Namespace ID determines the _syntactic_ interpretation of the
   Namespace Specific String (as discussed in [1]).







Moats                       Standards Track
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