Network Working Group K. Best
Request for Comments: 3120 OASIS, Inc.
Category: Informational N. Walsh
 Sun Microsystems, Inc.
 June 2001
 A URN Namespace for XML.org
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 that
 is engineered by the Organization for the Advancement of Structured
 Information Standards (OASIS) for naming persistent resources stored
 in the XML.org repository (such as XML (Extensible Markup Language)
 Document Type Definitions, XML Schemas, Namespaces, Stylesheets, and
 other documents).
1. Introduction
 The XML.org Registry is provided by XML.org as a public service where
 XML schemas, DTDs, stylesheets, and other documents can be shared.
 Documents are submitted to a repository then retrieved by others who
 may want to use them. These documents require unique identifiers.
 Motivated by these observations, XML.org would like to assign URNs to
 some resources in order to retain unique, permanent location-
 independent names for them.
 This namespace specification is for a formal namespace.
2. Specification Template
 Namespace ID:
 "xmlorg" requested.
 Registration Information:
 Registration Version Number: 3
 Registration Date: 2001年02月05日
 Declared registrant of the namespace:
 Karl Best
 OASIS - Organization for the Advancement of Structured
 Information Standards
 Post Office Box 455
 Billerica, MA USA 01821
 Phone: +1 (978) 667 5115
 Declaration of structure:
 The Namespace Specific String (NSS) of all URNs assigned by
 XML.org will have the following hierarchical structure:
 There is one branch at the top of the hierarchy: "objects".
 The Objects Hierarchy
 The general structure of the NSS in the names hierarchy has the
 form:
 urn:xmlorg:objects:{type}{:subtype}?:{object-id}
 where "type" identifies the document type (document, schema,
 stylesheet, entity, xmlns, etc.), the optional "subtype"
 provides additional information about the document type (for
 example, stylesheet or schema language), and "object-id" is a
 unique identifier for the document.
 The Director of Technical Operations at OASIS assigns document
 types, subtypes, and all unique identifiers.
 Relevant ancillary documentation:
 None
 Identifier uniqueness considerations:
 Identifier uniqueness will be enforced by the Director of
 Technical Operations who assigns unique identifiers to all
 documents identified by URN.
 Identifier persistence considerations:
 OASIS is committed to maintaining the accessibility and
 persistence of all the resources that are assigned URNs.
 Process of identifier assignment:
 Assignment is limited to the owner and those authorities that are
 specifically designated by the owner. OASIS may assign portions
 of its namespace for assignment by other parties.
 Process of identifier resolution:
 The owner will distribute catalogs (OASIS TR9401 Catalogs) that
 map the assigned URNs to resource identifiers (e.g., URLs). A
 more interactive, online resolution system will also be deployed
 in the near future.
 The owner will authorize additional resolution services as
 appropriate.
 Rules for Lexical Equivalence:
 URNs are lexically equivalent if they are lexically identical.
 Conformance with URN Syntax:
 No special considerations.
 Validation mechanism:
 None specified. The owner will publish OASIS TR9401 Catalogs.
 The presence of a URN in a catalog indicates that it is valid.
 Scope:
 Global
3. Examples
 The following examples are not guaranteed to be real. They are
 listed for pedagogical reasons only.
 urn:xmlorg:objects:schema:xmlschema:xcatalog
 urn:xmlorg:objects:dtd:xml:docbook:v4.1.2
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] Goldfarb, C. F., "ISO (International Organization for
 Standardization) ISO 8879:1986(E) Information Processing -- Text
 and Office Systems -- Standard Generalized Markup Language
 (SGML)", 1986.
 [2] W3C, XML WG, "Extensible Markup Language (XML) 1.0", February
 1998, <http://www.w3.org/TR/REC-xml>.
 [3] W3C, Namespaces WG, "Namespaces in XML", January 1999,
 <http://www.w3.org/TR/REC-xml-names>.
 [4] OASIS, Entity Mgmt. TC, "Entity Management: OASIS Technical
 Resolution 9401:1997 (Amendment 2 to TR 9401)", January 1994,
 <http://www.oasis-open.org/html/a401.htm>.
 [5] Moats, R., "URN Syntax", RFC 2141, May 1997.
 [6] Mealling, M. and R. Daniel, "URI Resolution Services Necessary
 for URN Resolution", RFC 2483, January 1999.
Authors' Addresses
 Karl Best
 OASIS, Inc.
 P.O. Box 455
 Billerica, MA 01821
 US
 EMail: karl.best@oasis-open.org
 Norman Walsh
 Sun Microsystems, Inc.
 One Network Drive
 MS UBUR02-201
 Burlington, MA 01803-0902
 US
 EMail: Norman.Walsh@East.Sun.COM
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