Hello again Nandha,

Quote:
Synchronization bar means ForkNode and Join Node.
When this option is OFF, they can be created only in a partition.
However, when this option is ON, you can create them outside of partitions independently.












Quote:
DeepHistory Pseudo state represents the most recent active configuration of the composite state that directly contains this pseudostate (e.g., the state configuration that was active when the composite state was last exited). A composite state can have at most one deep history vertex.

ShallowHistory Pseudo state represents the most recent active substate of its containing state (but not the substates of that substate). A composite state can have at most one shallow history vertex. A transition coming into the shallow history vertex is equivalent to a transition coming into the most recent active substate of a state.

[Reference] Object Management Group, Inc. UML Superstructure Specification, v2.2 P. 542

Satomi