[mkgmap-dev] Syntax Question

Fri Jun 17 11:17:21 BST 2011

Could someone explain to me the correct way  and position to use the (!) 
in the style files.

For example, in the current 'default style' the following two lines exist:

railway=rail & !(tunnel=yes) [0x14 resolution 21]

leisure=track & area!=yes

What is the significance of putting the (!) before the open brackets or 
before the (=) sign.

I mean, would there be any difference between the following two 
statements and would they both work?:

railway=rail & !(tunnel=yes)

railway=rail & tunnel!=yes

Many thanks.