[Mapcss] questions

[Vladimir Elistratov]

> [tunnel?][!bridge?]
>
> What is the meaning of the question mark "?" here?

> I believe JOSM uses [tunnel?] to mean "tunnel is tagged as yes or true"
(as opposed to [tunnel] which means "tunnel is tagged").

Then the meaning of [!bridge?] should be "bridge is NOT tagged as yes or
true". Right?

What is the status of that syntax with the question mark? Is it already
accepted for the specification?
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