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.
Best & Walsh Informational [Page 1]
RFC 3120 A URN Namespace for XML.org June 2001 Registration Information: Registration Version Number: 3 Registration Date: 2001-02-05 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. Best & Walsh Informational [Page 2]
RFC 3120 A URN Namespace for XML.org June 2001 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 Best & Walsh Informational [Page 3]
RFC 3120 A URN Namespace for XML.org June 2001 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 Best & Walsh Informational [Page 4]
RFC 3120 A URN Namespace for XML.org June 2001
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Best & Walsh Informational [Page 5]
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