Network Working Group A. Coates
Request for Comments: 3085 Reuters
Category: Informational D. Allen
 IPTC
 D. Rivers-Moore
 Rivcom
 March 2001
 URN Namespace for NewsML Resources
Status of this Memo
 This memo provides information for the Internet community. It does
 not specify an Internet standard of any kind. Distribution of this
 memo is unlimited.
Copyright Notice
 Copyright (C) The Internet Society (2001). All Rights Reserved.
Abstract
 This document describes a URN (Uniform Resource Name) namespace for
 identifying NewsML NewsItems. A NewsItem is an information resource
 that is expressible as a NewsML element within a NewsML document
 conforming to the NewsML Document Type Declaration (DTD) as defined
 by the International Press Telecommunications Council (IPTC).
1. Introduction
 NewsML is an XML format for packaging multimedia news resources. It
 has been created under the auspices of the International Press
 Telecommunications Council (IPTC), and version 1.0 was approved by
 the IPTC on 6 October 2000.
 The same logical NewsItem may exist in multiple physical locations.
 The NewsML specification allows NewsItems to have multiple URLs, but
 only a single URN. It is the latter which then uniquely names the
 resource.
 This namespace specification is for a formal namespace.
2. Specification Template
 Namespace ID:
 "newsml" requested.
 Registration Information:
 Registration Version Number: 1
 Registration Date: 2000年11月07日
 Declared registrant of the namespace:
 David Allen
 ho73@dial.pipex.com
 IPTC
 Royal Albert House
 Sheet Street
 Windsor
 SL4 1BE
 Declaration of structure:
 The identifier has the following ABNF[6] specification:
 NSS = ProviderId ":" DateId ":" NewsItemId ":" RevisionId Update
 ProviderId = string
 DateId = date
 NewsItemId = string
 RevisionId = posint
 Update = 0*1( "A" / "U" )
 date = century year month day
 century = ( "0" posdig ) / ( posdig DIGIT )
 year = 1*2DIGIT
 month = ( 0 posdig ) / ( "1" ( "0" "1" "2" ) )
 day = ( 0 posdig ) / ( ( "1" / "2" ) DIGIT ) / "30" / "31"
 string = 1*char
 char = ALPHA / DIGIT / symbol / escape
 symbol = "(" / ")" / "+" / "," / "-" / "." / "=" / "@" / ";" /
 "$" / "_" / "!" / "*" / "'"
 escape = "%" HEXDIG HEXDIG
 posint = posdig *DIGIT
 posdig = "1" / "2" / "3" / "4" / "5" / "6" / "7" / "8" / "9"
 The ProviderId must be an Internet domain name, and must be owned
 by the organisation creating the NewsML resource and allocating
 the URN to it, at the date identified by the DateId.
 DateId is a date in ISO 8601 Basic Format (CCYYMMDD), and must
 correspond to a date at which the organisation allocating the
 URN owned the domain name specified in the ProviderId.
 The NewsItemId must be unique among all NewsItems emanating from
 the same provider and having the same DateId.
 RevisionId is a positive integer indicating which revision of a
 given NewsItem this is. Any positive integer may be used, but
 it must always be the case that of two instances of a NewsItem
 that have the same ProviderId, DateId and NewsItemId, the one
 whose RevisionId has the larger value must be the more recent
 revision. A RevisionId of 0 is not permitted.
 If the NewsItem contains an "Update" element or elements, then
 Update must be set to "U". If the NewsItem consists only of a
 replacement set of NewsManagement data, then Update must be set
 to "A". If neither of these is the case, then Update must be
 suppressed.
 Relevant ancillary documentation:
 None
 Identifier uniqueness considerations:
 The combination of ProviderId and DateId serves to uniquely
 identify the organisation that is allocating the URN. That
 organisation is responsible for ensuring the uniqueness of the
 DateId/NewsItemId/RevisionId combination.
 Identifier persistence considerations:
 A NewsML URN may only be allocated by an organisation that owns an
 Internet domain name. The URN identifies a date on which the
 organisation owned that domain name. The combination of date
 and domain name will serve to uniquely identify that
 organisation for all time.
 Process of identifier assignment:
 The organisation identified by the ProviderId/DateId combination
 is responsible for allocating a NewsItemId that is unique among
 all those that it allocates with that DateId.
 Process of identifier resolution:
 NewsML providers are responsible for the provision of a URN
 resolution service, if any, for NewsML URNs they have assigned
 with a valid ProviderId/DateId combination.
 Rules for Lexical Equivalence:
 URNs are lexically equivalent if the ProviderId, DateId,
 NewsItemId, and RevisionId are all identical (case-insensitive
 comparison).
 Conformance with URN Syntax:
 No special considerations beyond the syntax herein described.
 Validation mechanism:
 Organisations that allocate NewsML URNs are responsible for the
 provision of a URN validation service, if any, for URNs they
 have assigned with a valid ProviderId/DateId combination.
 Scope:
 Global
3. Examples
 The following examples are representative of NewsML URNs, but may not
 refer to actual resources.
 urn:newsml:iptc.org:20001006:NewsMLv1.0:1
 urn:newsml:reuters.com:20000206:
 IIMFFH05643_2000年02月06日_17-54-01_L06156584:1U
4. Security Considerations
 There are no additional security considerations other than those
 normally associated with the use and resolution of URNs in general.
References
 [1] Rivers-Moore, D., "NewsML Version 1.0 Functional Specification",
 November 2000,
 <http://www.iptc.org/NewsML/specification/NewsMLv1.0.pdf>.
 [2] Rivers-Moore, D., "NewsML Version 1.0 DTD", November 2000,
 <http://www.iptc.org/NewsML/DTD/NewsMLv1.0.dtd>.
 [3] W3C, XML WG, "Extensible Markup Language (XML) 1.0", February
 1998, <http://www.w3.org/TR/REC-xml>.
 [4] Moats, R., "URN Syntax", RFC 2141, May 1997.
 [5] Daigle, L., van Gulik, D., Iannella, R. and P. Faltstrom, "URN
 Namespace Definition Mechanisms", RFC 2611, June 1999.
 [6] Crocker, D. and P. Overell, "Augmented BNF for Syntax
 Specifications: ABNF", RFC 2234, November 1997.
Authors' Addresses
 Anthony B. Coates
 Reuters
 85 Fleet St
 London EC4P 4AJ
 United Kingdom
 Phone: +44 20 75 42 21 65
 EMail: tony.coates@reuters.com
 David Allen
 IPTC
 Royal Albert House
 Sheet Street
 Windsor SL4 1BE
 United Kingdom
 Phone: +44 17 53 70 50 51
 EMail: ho73@dial.pipex.com
 Daniel Rivers-Moore
 Rivcom
 Lotmead Business Village
 Swindon SN4 0UY
 United Kingdom
 Phone: +44 17 93 79 20 00
 EMail: daniel.rivers-moore@rivcom.com
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