What is the exact difference between a node and a task-node? Also how can we convert an XPDL file into a JPDL file??
regading the node and task-node please read the docs... it's all in there.
regaring the conversion... by manually mapping and hoping something comes out that works. There are some fundamental differences (I do not know them by hart, but Koen once told me) so you probably have to convert some constructs as well.