Filtering using IN Operator in Geoserver

The OGC filter encoding standard – for whatever reason – lacks the useful IN operator we know and love from other languages like SQL [1]. Geoserver developers have therefore implemented this functionality as a non-standard SLD function [2]. Unfortunately this implementation requires prior knowledge of the number of arguments in the IN clause and it’s limited to 10 arguments.

An example filter would look like this:

       <ogc:Function name="in3">



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