Network Working Group K. Best
Internet-Draft OASIS, Inc.
Expires: June 18, 2001 N. Walsh
Sun Microsystems, Inc.
December 18, 2000
A URN Namespace for XML.org
xmlorg
draft-best-xmlorg-00.txt
Status of this Memo
This document is an Internet-Draft and is in full conformance with
all provisions of Section 10 of RFC2026.
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Copyright Notice
Copyright (C) The Internet Society (2000). All Rights Reserved.
Abstract
This document describes a URN 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 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
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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: 1
Registration Date: 2000-12-18
Declared registrant of the namespace:
OASIS
Karl Best
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:
Best & Walsh Expires June 18, 2001 [Page 2]
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 accessability 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). In addition, the owner may provide an online resolution
service based on RFC2483.
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.
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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
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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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Acknowledgement
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