I have a rather theoretical question: if I want to depict on a diagram communication between different pools, I can use the Message Flow. But with Message Flow I’m limited to connecting events of “Message” type only.
In some cases communication can be based on signals. But BPMN2.0 doesn’t provide any graphical means to connect throwing and catching signal events located in different pools.
Is there any (conceptual) reason why BPMN does not support this?