Sometimes "may not" is used to express a prohibition.
Do not use this phrase. See Annex H of ISO/IEC directives Part 2.
All parts
ed
Proposed Disposition of DIS 29500 Comment JP-0008 (Modified: 2007-12-14) Agreed; some uses of “shall,” “may,” and so on, are inconsistent. Rather than enumerate all places that need changes in this response, general comments on such usage will be addressed in an editorial pass over all parts. This editorial pass will address the comments as follows: The word shall will be used to indicate requirements even if a feature is optional. As a deprecated feature is not optional, the use of shall in such a context makes sense. The word may will be replaced by can or might, as appropriate. The use of may is especially problematic in the negative; does may not mean cannot or might not? These instances will be carefully reviewed and changed. The word must will only be used in informative contexts, never instead of shall. Regarding the use of will and an alternate tense usage, this change will be made. Similar Comments: AU-0007 , DE-0042 , DK-0076 , ECMA-0018 , GB-0014 , JP-0006 , JP-0007 ,
