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Network Working Group                                        M. MeallingRequest for Comments: 3061                                      VerisignCategory: Informational                                    February 2001Obsoletes:3001A URN Namespace of Object IdentifiersStatus 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 Uniform Resource Name (URN) namespace that   contains Object Identifiers (OIDs).  It obsoletesRFC 3001.1. Introduction   An Object Identifier is a tree of nodes where each node is simply a   sequence of digits.  The rules roughly state that once an entity is   assigned a node in the Object Identifier (OID) tree, it has sole   discretion to further subdelegate sub-trees off of that node. Some   examples of OIDs include:   o  1.3.6.1 - the Internet OID   o  1.3.6.1.4.1 - IANA-assigned company OIDs, used for private MIBs      and such things   o  1.3.6.1.2.1.27 - The Applications MIB   o  0.9.2342.19200300.100.4 - Object ID's used in the directory pilot      project to identify X.500 Object Classes.  Mostly defined inRFC1274.   This document specifies the "oid" URN namespace [2].  This namespace   is for encoding an Object Identifier as specified in ASN.1 [3] as a   URI.RFC 3001 [1] is obsoleted by this specification.   The namespace specification is for a formal namespace.Mealling                     Informational                      [Page 1]

RFC 3061                   OID URN Namespace               February 20012. Specification Template   Namespace ID:      "oid" requested.   Registration Information:       Registration Version Number: 1       Registration Date: 2000-04-30   Declared registrant of the namespace:      The ISO/IEC Joint Technical Committee 1 - SubCommittee 6         The real authority is the ASN.1 specification itself but SC6 is         the committee that has the authority to interpret what that         means, thus that committee is listed as the registrant.   Declaration of structure:      The NSS portion of the identifier is based on the string encoding      rules found inRFC 1778 Section 2.15 [4] which specifies a series      of digits separated by a period with the most significant digit      being at the left and the least significant being at the right.      At no time shall the NSS portion of the URN contain the human      readable description of a particular node in the OID tree.  The      NSS portion of the name is strictly limited to the digits 0-9 and      the '.' character with no leading zeros. No other characters are      permitted. This is all expressed in the following ABNF:           oid             = number *( DOT number )           number          = DIGIT / ( LEADDIGIT 1*DIGIT )           LEADDIGIT       = %x31-39 ; 1-9           DIGIT           = %x30 / LEADDIGIT ; 0-9           DOT             = %x2E ; period      No changes are anticipated since Object Identifiers are fairly      simple and have been standardized with no changes for many years.   Relevant ancillary documentation:      Relevant documentation can be found in X.660/Amd 2 | ISO/IEC      9834-1/Amd 2[3].Mealling                     Informational                      [Page 2]

RFC 3061                   OID URN Namespace               February 2001   Identifier uniqueness considerations:      The rules for assignment of OIDs requires that each OID be unique      to the OID space and that it cannot be reassigned or reused.  By      reference this URN namespace inherents those rules.   Identifier persistence considerations:      The rules concerning the use of OIDs requires that they not be      reused once assigned.  By reference this URN namespace inherents      those rules.   Process of identifier assignment:      Once an OID is assigned to some entity, that entity can then      create and assign new OIDs below that particular OID.  There are      multiple entities that assign new OIDs to the general public.  The      top three levels are pre-assigned as follows:         0 - ITU-T assigned         1 - ISO assigned         2 - Joint ISO/ITU-T assignment      several assigned OIDs that are of importance to the Internet are:         1.3.6.1 - the Internet OID         1.3.6.1.4.1 - IANA-assigned company OIDs, used for private         MIBs and such things   Process of identifier resolution:      At this time no resolution mechanism is defined.   Rules for Lexical Equivalence:      OIDs are composed of multiple occurrences of digits and the "."      character.  Lexical equivalence is achieved by exact string match.   Conformance with URN Syntax:      There are no additional characters reserved.   Validation mechanism:      None.Mealling                     Informational                      [Page 3]

RFC 3061                   OID URN Namespace               February 2001   Scope:      Global3. Examples   The following examples are taken from the example OIDs from the   Introduction:      urn:oid:1.3.6.1      urn:oid:1.3.6.1.4.1      urn:oid:1.3.6.1.2.1.27      URN:OID:0.9.2342.19200300.100.44. Security Considerations   None not already inherent to using unverifiable OIDs.5. Acknowledgements   The author would like to thank Harald Alvestrand for the use of his   OID database as a source for examples and references.References   [1]  Mealling, M., "A URN Namespace of Object Identifiers",RFC 3001,        November 2000.   [2]  Moats, R., "URN Syntax",RFC 2141, May 1997.   [3]  CCITT, "Specification of Basic Encoding Rules for Abstract        Syntax Notation One (ASN.1)", CCITT Recommendation X.209,        January 1988.   [4]  Howes, T., Kille, S., Yeong, W. and C. Robbins, "The String        Representation of Standard Attribute Syntaxes",RFC 1778, March        1995.Mealling                     Informational                      [Page 4]

RFC 3061                   OID URN Namespace               February 2001Author's Address   Michael Mealling   Verisign   505 Huntmar Park Drive   Herndon, VA  22070   US   Phone: +1 770 935 5492   EMail: michaelm@netsol.com   URI:http://www.netsol.comMealling                     Informational                      [Page 5]

RFC 3061                   OID URN Namespace               February 2001Full 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 RFC Editor function is currently provided by the   Internet Society.Mealling                     Informational                      [Page 6]