Suspend state can go to perform state again in workflow engine's management.
End state means end the implementation status of previous step, go to new ready state.
The last step is finish state, this state can not restart, and it only can begin in the next origin state.
Origin node and activity node select execution's path through the external conditions.
In activity, we need to define the role of actors and the permission of the execution's path.
For each activity, we need to describe the activity's duration, task priority and the conditions of activity's implementation, to ensure the workflow can be run accurately in the actual operation.