This arc is restricted to the ITU-T (International
Telecommunications Union - Telecommunication standardization
sector) Recommendations (not jointly published with ISO/IEC), to the PTTs and RPOAs (Registered Private Operating Authorities).
This arc is also called ccitt(0) to recall that CCITT used to be an organization independent from ITU-T. The identifier itu-r was added at the ITU-T Study Group 17 Closing Plenary on March 19, 2004 (and was ratified by Resolution 6.9.12 at the Sept. 2005 meeting of ISO/IEC JTC1/SC6). It can only be used as a 'NameAndNumberForm' (that is, followed by number 5 between parentheses) for OIDs that commence with {itu-r(0) r-recommendation(5)} (see Rec. ITU-T X.680 (2004) | ISO/IEC 9834-1:2004, A.5, for more details on this specific case). Consequently the Unicode label ITU-R can only be used for IRIs that designate OIDs under the {itu-r(0) r-recommendation(5)} arc.
Information:
Operation is in accordance with Rec. ITU-T X.660 | ISO/IEC 9834-1 "Procedures for the Operation of OSI Registration Authorities: General Procedures and ASN.1 Object Identifier tree top arcs" and is under the guidance of ITU-T Study Group 17.
All decisions related to subsequent arcs, other than the assignment of additional secondary identifiers to top-level arc 0 (see Rec. ITU-T X.660 (2004) | ISO/IEC 9834-1:2004, A.5), will be recorded ad amendments to
Rec. ITU-T X.660 | ISO/IEC 9834-1 (such changes to the joint ITU-T | ISO/IEC text will be regarded as editorial by ISO).
From Rec. ITU-T X.660 (2004) | ISO/IEC 9834-1:2004, "the top-level arcs are restricted to three arcs numbered 0 to 2; and the arcs beneath root arcs 0 and 1 are restricted to forty arcs numbered 0 to 39. This enables optimized encodings to be used in which the values of the top two arcs for all arcs under top-level arcs 0 and 1 encode in a single octet in an object identifier encoding (see the Rec. ITU-T X.690 series | ISO/IEC 8825 multi-part Standard).
recommendation(0)
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