Network Working Group M. Mealling Request for Comments: 3061 Verisign Category: Informational February 2001 Obsoletes: 3001 A URN Namespace of Object Identifiers 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.
AbstractThis document describes a Uniform Resource Name (URN) namespace that contains Object Identifiers (OIDs). It obsoletes RFC 3001. RFC 1274. This document specifies the "oid" URN namespace . This namespace is for encoding an Object Identifier as specified in ASN.1  as a URI. RFC 3001  is obsoleted by this specification. The namespace specification is for a formal namespace.
RFC 1778 Section 2.15  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.
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: 184.108.40.206 - the Internet OID 220.127.116.11.4.1 - 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.
Scope: Global  Mealling, M., "A URN Namespace of Object Identifiers", RFC 3001, November 2000.  Moats, R., "URN Syntax", RFC 2141, May 1997.  CCITT, "Specification of Basic Encoding Rules for Abstract Syntax Notation One (ASN.1)", CCITT Recommendation X.209, January 1988.  Howes, T., Kille, S., Yeong, W. and C. Robbins, "The String Representation of Standard Attribute Syntaxes", RFC 1778, March 1995.
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