Hi
> railway=rail& !(tunnel=yes)
>
> railway=rail& tunnel!=yes
In this particular case they are the same.
I would normally prefer the second as being more readable, but something
like:
!(red=yes | green=yes | blue=yes)
may be easier to read than the equivalent:
red!=yes & green!=yes & blue!=yes
In other cases however you have to consider if the tag exists. So
although
speed<30
and
!(speed>=30)
are logically the same, this is only the case if the speed tag
exists (and is a number).
So if there is no speed tag, both '<' and '>=' would give false
against any number and so
speed<30 is false
and
speed>=30 is false
and so
!(speed>=30) is true
..Steve
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