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RFC3120 - A URN Namespace for XML.org

王朝other·作者佚名  2008-05-31
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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: 2001-02-05

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.

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", RFC2141, May 1997.

[6] Mealling, M. and R. Daniel, "URI Resolution Services Necessary

for URN Resolution", RFC2483, 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

Full Copyright Statement

Copyright (C) The Internet Society (2001). All Rights Reserved.

This document and translations of it may be copied and furnished to

others, and derivative works that comment on or otherwise eXPlain it

or assist in its implementation may be prepared, copied, published

and distributed, in whole or in part, without restriction of any

kind, provided that the above copyright notice and this paragraph are

included on all such copies and derivative works. However, this

document itself may not be modified in any way, such as by removing

the copyright notice or references to the Internet Society or other

Internet organizations, except as needed for the purpose of

developing Internet standards in which case the procedures for

copyrights defined in the Internet Standards process must be

followed, or as required to translate it into languages other than

English.

The limited permissions granted above are perpetual and will not be

revoked by the Internet Society or its successors or assigns.

This document and the information contained herein is provided on an

"AS IS" basis and THE INTERNET SOCIETY AND THE INTERNET ENGINEERING

TASK FORCE DISCLAIMS ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING

BUT NOT LIMITED TO ANY WARRANTY THAT THE USE OF THE INFORMATION

HEREIN WILL NOT INFRINGE ANY RIGHTS OR ANY IMPLIED WARRANTIES OF

MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.

Acknowledgement

Funding for the RFCEditor function is currently provided by the

Internet Society.

 
 
 
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