On 2/6/2015 10:23 AM, Thomas Harre wrote:
> But is this garanteed?

See ISO-32000-1 section 12.7.4.2.3 "Check Boxes": The appearance for the 
off state is optional but, if present, shall be stored in the appearance 
dictionary under the name Off. Yes should be used as the name for the on 
state.

People who are used to reading ISO specifications know that "shall" 
means that a normative rule is imposed: no other name, except "Off" is 
allowed for the off state.
People who are used to reading ISO specifications also know that 
"should" means that a recommendation is being made: it is recommended to 
use "Yes" for the on state, but if you use any other name, your PDF is 
still valid. (And it is common practice to use names other than "Yes".)

Does this answer your question?

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