AFAIK { set: key=value; } have only been discussed, I hope that pgmapcss can 
implement it, though I havn’t been able to test it or discuss it any further 
with the developer.

Aun Johnsen

> On May 12, 2017, at 14:18, Bjoern Hassler <[email protected]> wrote:
> 
> OK, many thanks - I guess this is a fairly new feature. Do you know where 
> this is documented, or what applications support it yet?
> 
> Bjoern
> 
> On 12 May 2017 at 16:33, Aun Johnsen <[email protected] 
> <mailto:[email protected]>> wrote:
> Bjørn
> 
> I don’t know if it will work, but the way I have been thinking is like this:
> 
> way[highway=residential][!surface] {
>       set:    surface=unpaved;
> }
> way[highway=motorway][!surface] {
>       set:    surface=paved;
> }
> 
> This is done so I can assume default values later in the sheet, without 
> having to test explicitly for untagged ways for each test. If it works on the 
> implementation of mapcss, it will come handy on complex stylesheets.
> 
> Aun Johnsen
> 
>> On May 12, 2017, at 12:08, Bjoern Hassler <[email protected] 
>> <mailto:[email protected]>> wrote:
>> 
>> Aun, can you say a little  more about "set tag=value"? I assume these are 
>> css tags? What's the purpose? 
>> 
>> 
> 
> 
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