look at the testcases/examples in the sourcecode. There is enough info there. Besides that, search this forum, has been asked and answered before (searchbehaviour by default is OR, so pay attention to your query)
In the examples there isn't enough information about what i'am looking for
in fact i'am looking for who to use à "decision node" in a business process, but in the examples there is a simple "task node"
That is why I said examples/testcases. See
src\java.jbpm.test\org\jbpm\jpdl\exe for jbpm 3.1 or jpdl\jar\src\test\java\org\jbpm\jpdl\exe in cvs-head
Or ...... STFF, this fine forum....