I am using Activiti Modeler. When I use a StartEvent, this element allows to me to include just Form Properties, but the option to include a Form Key is not available. I think it should include this option to accomplish with both options described in the book. Also accoding to the book the CATEGORY of a process definition is the value in the "targetNameSpace" of a bpmn FILE. When I create a process in Activiti Modeler, it allows to me to write a VALUE in that attribute, the problem resides when I export that model to a BPMN file, that value is missing, it is not exported to the BPMN file. That attribute in the exported file always has a default vaule (http://www.activiti.org/test).