An example of the XML of a signal boundary events is:
<bpmn2:boundaryEvent id="BoundaryEvent1" attachedToRef="ServiceTask3">
<bpmn2:signalEventDefinition signalRef="Signal_0iikg75" />
</bpmn2:boundaryEvent>
An example of the XML of a signal with a global scope is:
<bpmn2:signal id="Signal_0hnsd2r" name="Signal_0hnsd2r" />
An example of the XML of a signal with a process instance scope is:
<bpmn2:signal id="Signal_0hnsd2r" name="Signal_0hnsd2r" activiti:scope="processInstance" />