Network Working Group F. Dijkstra
Internet-Draft SARA
Intended status: Informational R. Hughes-Jones
Expires: November 03, 2011 DANTE
May 02, 2011

A URN Namespace for the Open Grid Forum (OGF)
draft-dijkstra-urn-ogf-02

Abstract

This document describes a URN (Uniform Resource Name) namespace that is engineered by the Open Grid Forum (OGF) for naming persistent resources.

Status of this Memo

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This Internet-Draft will expire on November 03, 2011.

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Table of Contents

1. Introduction

The Open Grid Forum (OGF) is a standardisation development organisation in the field of distributed computing. The OGF produces documents such as working drafts, specifications, and schemata. For more information, see http://www.ogf.org/

Working groups in the OGF community have expressed the need for global, distributed, persistent identifiers in working drafts and standards. Motivated by this need, the OGF 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.

1.1. Requirements Language

The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in [RFC2119].

2. URN Specification for "ogf" NID

2.1. Namespace ID

"ogf" requested.

2.2. Registration Information

Registration Version Number: 1
Registration Date: yyyy-mm-dd

2.3. Declared registrant of the namespace

Technical Director
Open Grid Forum
P.O. Box 2326
Joliet, Illinois 60434
USA
http://www.ogf.org/
Email: urn@ogf.org

The position of technical director is currently fulfilled by Joel Replogle.

2.4. Declaration of syntactic structure

The formal syntax definitions below are given in ABNF [RFC5234].

The NSS in the urn:ogf names hierarchy begins with a subnamespace identifier (SNID), followed by a delimiter and a subnamespace-dependent string

   OGF-URN  =  "urn:ogf:" SNID ":" SUBNAMESPACE-SPECIFIC-STRING

where SNID is a unique subnamespace identifier for the specification, and SUBNAMESPACE-SPECIFIC-STRING is a unique identifier within the subnamespace identifier scope.

SNID has the same syntax as a <NID> as defined in [RFC2141]:

   SNID  =  ( ALPHA / DIGIT )  *31( ALPHA / DIGIT / "-" )

ALPHA and DIGIT are defined in Appendix B of [RFC5234].

The Technical Director at OGF (or their successor) assigns subnamespace identifiers.

The syntax of SUBNAMESPACE-SPECIFIC-STRING is dependent on the SNID, and MUST be defined by a Grid Forum Document [GFD-SERIES]. This document does not pose any additional restrictions to the SUBNAMESPACE-SPECIFIC-STRING other than what is defined in the NSS syntax as defined by [RFC2141] or its successor:

   SUBNAMESPACE-SPECIFIC-STRING  =  1*<URN chars>

<URN chars> is defined in Section 2.2 of [RFC2141].

2.5. Relevant ancillary documentation

The Technical Director at OGF (or it successor) will keep a list of assigned subnamespace identifiers and associated documentation at http://www.ogf.org/urn/ [URN-OGF].

Information on the procedures how to register an subnamespace identifier can also be found at this website.

2.6. Identifier uniqueness considerations

Identifier uniqueness will be enforced by the Technical Director of the Open Grid Forum.

2.7. Identifier persistence considerations

The Technical Director will only assign subnamespace identifiers for persistent resources.

2.8. Process of identifier assignment

Assignment of subnamespace identifiers is limited to the OGF and those authorities that are specifically designated by the OGF Technical Director. OGF may assign portions of its namespace (specifically, those under designated subnamespace identifiers) for assignment by third parties.

The details of this process will be specified at the OGF website [URN-OGF].

The syntax and semantics of each SNID MUST be defined by a Grid Forum Document [GFD-SERIES] before it is assigned.

2.9. Process of identifier resolution

OGF will maintain an index of all subnamespace identifiers on its Web site, http://www.ogf.org/urn/.

Resolution mechanism of SUBNAMESPACE-SPECIFIC-STRING within each SNID MUST be defined before assignment of a subnamespace identifier.

2.10. Rules for Lexical Equivalence

The SNID part of URNs in the OGF hierarchy is case insensitive. Thus, the SNID MUST be case normalised before comparison.

The rules for lexical equivalence of the SUBNAMESPACE-SPECIFIC-STRING part of URNs in the OGF hierarchy is specific for each SNID and MUST be defined when a SNID is assigned by the OGF Technical Director. These definitions MUST included information about case sensitivity, and in case %-escaped octets, MUST define the exact normalisation to use (e.g. interpret as octet, interpret as UTF-8, specify type of Unicode normalisation factor, etc.)

2.11. Conformance with URN Syntax

At the moment of writing, a revision of RFC2141 is proposed, which may allow a different set of allowed characters (URN-char) in the NSS than the current URN chars (adding "&" and/or "~", whilst removing the reserved characters "%", "/", "?" and "#"). The intention of this document is to only restrict the syntax of the SNID, and have Grid Forum Documents specify the syntax of the SUBNAMESPACE-SPECIFIC-STRING. If RFC 2141 is to be updated, this document may be revised as well.

In other words, the current definition:

   SUBNAMESPACE-SPECIFIC-STRING  =  1*<URN chars>

is likely to change in the future to:

   SUBNAMESPACE-SPECIFIC-STRING  =  1*<URN-char>

It is RECOMMENDED that assigned OGF URNs only characters acceptable by both RFC2141 and the expected revision. It is RECOMMENDED that software implementation accepting OGF URNs allow characters acceptable by either RFC2141 or the expected revision.

2.12. Validation mechanism

The validation mechanism of URNs in the OGF hierarchy is specific for each SNID and MUST be defined when a SNID is assigned by the OGF Technical Director.

URNs in the OGF hierarchy without an assigned SNID are considered to be invalid.

2.13. Scope

Global URNs, relevant for the distributed computing community in general, and the Open Grid Forum in particular.

3. Examples (Informative)

Since no subnamespace identifiers have been defined yet, no actual examples can be given. Therefore, the following examples are not guaranteed to be real or even syntactically correct.

Grid forum documents defining the "gfd" and "network" subnamespace identifiers may give the following examples.

4. Namespace Considerations

The Open Grid Forum (OGF) is a standardisation development organisation in the field of distributed computing.

The use of the OGF hierarchy is expected to be broad, including but not limit to usage for:

The Open Grid Forum is dedicated to openly publish all technical documentation related to URNs in the OGF hierarchy and allow unlimited distribution of these documents.

5. Community Considerations

Members of the distributed computing community will benefit from persistent and globally unique identifiers for use in protocols developed by the Open Grid Forum.

Practical use of the urn:ogf namespace has been detected, and a formal registration will allow the Open Grid Forum to document this usage and enforce technical review of current practices.

6. Security Considerations

There are no additional security considerations other than those normally associated with the use and resolution of URNs in general.

Implementors are recommended to check the OGF registry and documentation [URN-OGF] before assuming that a given identifier is valid or has a certain meaning.

7. IANA Considerations

IANA is to kindly requested to register the "ogf" namespace identifier (NID) at the URN Namespaces registry [URN-NAMESPACES] and refer to this document and/or the website http://www.ogf.org/urn/.

8. Acknowledgements

The authors like to thank Joel Replogle and Andre Mersky for helping set up the urn:ogf registry. Jeroen van der Ham proof-read this document. The template and useful examples from [RFC3406] formed the basis for this document.

9. References

9.1. Normative References

[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, March 1997.
[RFC2141] Moats, R., "URN Syntax", RFC 2141, May 1997.
[RFC5234] Crocker, D. and P. Overell, "Augmented BNF for Syntax Specifications: ABNF", STD 68, RFC 5234, January 2008.

9.2. Informative References

[RFC3406] Daigle, L., van Gulik, D., Iannella, R. and P. Faltstrom, "Uniform Resource Names (URN) Namespace Definition Mechanisms", BCP 66, RFC 3406, October 2002.
[URN-NAMESPACES] IANA, "Official IANA Registry of URN Namespaces", .
[GFD-SERIES] Open Grid Forum, "OGF Document Series", .
[URN-OGF] Open Grid Forum, "URN:OGF Hierarchy Registry and Documentation", .

Authors' Addresses

Freek Dijkstra SARA Science Park 121 Amsterdam, 1098 XG NL EMail: Freek.Dijkstra@sara.nl
Richard Hughes-Jones DANTE City House 126-130 Hills Road Cambridge, CB2 1PQ UK EMail: Richard.Hughes-Jones@dante.net