I'm using the Predefined filter app and want to add a filter to my listview. I don't understand how the XPATH system works and the more I read about it the less I understand. What XPATH constraint do I need to filter a listview filled with Pakket based on Hoofdprocess and Netwerk? A servicepakket could belong to two networks and thus adding an attribute to filter it that way would not work. It'd be even more of a mess for Dienstenpakket.