[Mapcss] questions

[Vladimir Elistratov]

Hi!

I'm new here! I'm working on javascript MapCSS parser.

I couldn't find answers to the following questions in the wiki:

1.
[tunnel?][!bridge?]

What is the meaning of the question mark "?" here?

2.
Is it correct syntax for a zoom definition:
way|z-7 {

}
I.e. the rule is defined for zoom levels from 0 to 7?

Thanks,
Vladimir Elistratov
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