We are making some tests with google maps api and kml.
We display a map of Europe where each Country has a different color
based on some data of interest. Everything is inside a kmz such as
tyhe following:

http://test.coscini.it/Interporto/kml/Europa2009Transiti.kmz

That kmz contains both static and dynamic data: the ploygons of
Countries are static, they don't change, while the colour of the
Country is dependent on some dynamic data. The kmz contains a summary
of other data of interests too.
We are thinking about  a better way to achive the same result.
We suppose static data such as the polygons of the Countries fit well
inside a kml, generated once for all. Dynamic data, the ones contained
inside the placemark tag in our kmz, can be displayed creating new
markers from a json array which is generated on demand because it
contains changing values. The first question is how we can modify the
colour of the Countries (whose polygons are in the kmz ) to reflect
the actual values loaded  from the json array. The second question is
if this a valid approach or if there are better ones.

Thanks
Filippo
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