Open the boundaryTimerProcess.bpmn file with the eclipse BPMN2 editor.
The editor will ask you if you want to create the (visual) elements. Click yes.
Once the elements have been created, try to close and save the file. The BPMN2 editor will provide the following error message:
"The file can not be saved because the current state of the model is invalid. Please resolve the following issues before saving:
No targetNamespace defined."