[Mapcss] Associating overpass result sets with MapCSS, was: Re: Example for "set"

[tom.davie at gmail.com]

In general, this feature causes problems for implement its.  It stops MapCSS being a declarative language, and makes it procedural instead.  That closes off a bunch of avenues for implementing the language in a way that works fast enough for real time applications.

There's a reason that css doesn't have this feature.

Sent from my iPhone

> On May 12, 2017, at 10:28, Bjoern Hassler <bjohas+mw at gmail.com> wrote:
> 
> Ah ok, many thanks!
> Bjoern
> 
>> On 12 May 2017 at 18:26, Aun Johnsen <lists at gimnechiske.org> wrote:
>> 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 <bjohas+mw at gmail.com> 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 <lists at gimnechiske.org> 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 <bjohas+mw at gmail.com> 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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