| Network Working Group | F. Dijkstra |
| Internet-Draft | SARA |
| Intended status: Informational | R. Hughes-Jones |
| Expires: November 27, 2011 | DANTE |
| May 26, 2011 |
A URN Namespace for the Open Grid Forum (OGF)
draft-dijkstra-urn-ogf-03
This document describes a URN (Uniform Resource Name) namespace that is engineered by the Open Grid Forum (OGF) for naming persistent resources.
This Internet-Draft is submitted in full conformance with the provisions of BCP 78 and BCP 79.
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This Internet-Draft will expire on November 27, 2011.
Copyright (c) 2011 IETF Trust and the persons identified as the document authors. All rights reserved.
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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.
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].
"ogf" requested.
Registration Version Number: 1
Registration Date: yyyy-mm-dd
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.
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 successors) assigns subnamespace identifiers (SNID).
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].
The Technical Director at OGF (or their successors) 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 a subnamespace identifier can also be found at this website.
Identifier uniqueness will be enforced by the Technical Director of the Open Grid Forum.
The Technical Director will only assign subnamespace identifiers for persistent resources.
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 subnamespace MUST be defined by a Grid Forum Document [GFD-SERIES] before the corresponding subnamespace identifier (SNID) is assigned.
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.
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.)
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.
The validation mechanism of URNs in the OGF hierarchy is specific for each SNID and SHOULD 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.
Global URNs, relevant for the distributed computing community in general, and the Open Grid Forum in particular.
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.
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.
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.
There are no additional security considerations other than those normally associated with the use and resolution of URNs in general.
Implementers are recommended to check the OGF registry and documentation [URN-OGF] before assuming that a given identifier is valid or has a certain meaning.
IANA is 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/.
The authors would like to thank Joel Replogle and Andre Mersky for helping set up the urn:ogf registry, and Jeroen van der Ham for proof-reading this document. The template and useful examples from [RFC3406] formed the basis for this document.
| [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. |
| [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", . |