[email protected] wrote:
> After having made some experiments I figured out that "when visible" state
> come up when the given property (printable, exportable) of the layer
> (optional content) is not set at all. So you are right pointing out there
> are only two explicit values (true and false) which respects the PDF
> reference. At the same time the "lack" of the given setting is somehow a
> 3rd state (when visible).

That's interesting information.
Maybe I should add the possibility of omitting values.
I assumed there were only two states possible:
ON or OFF, but you are right: it's not really a boolean.
There could be a third state: ON, OFF and null.
I'll have a closer look at it.
-- 
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