On Fri, Sep 22, 2017 at 1:36 PM, Stefan Overkamp <
stefan.overk...@gisworks.info> wrote:
> Hi geoserver-community,
>
> creating a style in CSS-Format translates the style to sld-XML.
>
> The documentation states:
> The SLD Name for a rule is autogenerated based on the filters from the CSS
> rules that combined to form it, for aid in troubleshooting.
>
> Instead of this, there is no sld name property added to the rule ( no
> <sld:Rule><sld:Name>1</sld:Name> (...))
> Because of this, getLegendGraphic cant be limited to specific rules.
>
> Is this a bug or a configuration problem?
>
Hmm... I'm not sure how to classify it. Yes, CSS does not emit a "Name" for
rules, this is "by design", mostly because
I never needed that (and neither did the original author of the module, it
seems).
Generally speaking legends generated by the CSS styles are difficult to
use, they don't have a very predictable order
(there is one, but it's difficult to explain) and a complex CSS will
generate "dead rules" that do show up in the legend
but do not exist in the map.
But then again, I've used CSS mostly for complex styles with hundreds of
CSS rules, this is the situation where
dead rules generation happens and the legend is pretty much useless as it
ends up containing thousands of possible different cases.
For simpler CSS styles it should be manageable.
When simple enough, the code goes into a deeper inspection mode, which
takes more time to turn the CSS to SLD but does not generate dead rules.
Giving unique names can also be challenging, the "title" cannot be really
used as CSS rules might be missing titles,
leading to multiple generated SLD rules with the same title/name (e.g., if
your parcel rule did not have a title, the two generated
SLD rules would be both titled "borders").
It seems that you're suggesting to use a progressive number... that is of
course unique and easy to implement, maybe with some predictability issue
(change the orginal CSS so that the rule priority changes, and the same
number might not hit
the same SLD rule anymore).
Probably good enough though?
Cheers
Andrea
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