I see that union and buffer are listed features here:
http://docs.geoserver.org/latest/en/user/filter/function_reference.html#filter-function-reference

Are there any examples of how to use them with WFS?

In the application the user should be able to draw a rectangle which is
used with an intersect filter to select all the parcels the rectangle
intersects with (this part is working).

I'd then like to be able to get a buffer of the union of the selected
parcels.

Is this something WFS can do, or do I need to be looking at WPS and JTS?

Thanks,
Michael Moore
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