This arc contains a sub-arc for every ISO and IEC International
Standard (not jointly published with ITU-T).
Information:
According to ISO/IEC 9070:1991, 5.2.1 (editor: Charles Goldfarb), subsequent arcs should be of the form {iso(1) standard(0) nnnn pp yyyy} where:
nnnn is replaced by the number of an ISO publication;
pp is replaced by the part number (if any);
yyyy is replaced by the year of publication. The form of ISO publication authority prefix that includes the year of publication should be used to name objects that may undergo revision. The form that does not include the year of publication should be used to name objects that will not undergo revision.
This is confirmed by Rec. ITU-T X.660 (2004) | ISO/IEC 9834-1:2004: "The arcs below standard shall each have the value of the number of an International Standard published by ISO or IEC. Where the International Standard is multi-part, there shall be an additional arc for the part number, unless this is specifically excluded in the text of the International Standard. Further arcs shall have values as defined in that International Standard.
NOTE: If a non-multipart International Standard allocates object identifiers, and subsequently becomes a multipart International Standard, it shall continue to allocate object identifiers as if it were a single part International Standard."