Hi Andrea,

First, the CSS extension is awesome; thank you for your hard work on 
it.  I have a few quick questions...

1.  I am trying to style GDELT data by EventCode.  The first two 
characters of the EventCode string would be sufficient to name the file 
I want.  I was able to make a separate rule for each code, but it'd be 
more convenient to do something like

    mark: url([strConcat(strSubstring(EventCode, 0, 2), '.svg')]);

If I'm reading this 
https://github.com/geotools/geotools/blob/master/modules/unsupported/css/src/main/java/org/geotools/styling/css/CssParser.java#L321
 
right, it looks like Functions may not work.  The docs hint that 
Expressions might be ok: 
http://docs.geoserver.org/stable/en/user/extensions/css/properties.html.

Did I goof the syntax?  If not, I'd be happy to help cook up a quick PR 
if expresssions/functions in url should be allowed.

2.  How does the CSS extension interact with GeoServer's SLD extensions?

3.  In the CSS Styles GeoServer UI, I think it'd be awesome to keep the 
same map extent as one switches between the tabs.  If you like the idea, 
I might be able to play with it over the next few weeks.

Cheers,

Jim

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