In the previous section, you learned about creating WPS requests with WPS request builder. In this section, you'll learn how to make more complex WPS requests with process chaining. First, we'll take a look at a chain process request in plain XML. Next, we'll create an even more complex request. Finally, we'll add this request to a minimal OpenLayers web app to test the results of POST.
Here is our first process-chained XML, and you can see that the first WPS process is started here with this wps:Execute operation. The identifier is gs:CollectGeometries, so it's the gs:CollectGeometries process that we're running here, as shown in the following code:
<?xml version="1.0" encoding="UTF-8"?><wps:Execute version="1.0.0" service="WPS" ...
