Whether execution of the current action should stop after this
command
Returns false by default, override this and return true
if the action permanently goes to a new state (eg.
Whether the initial action should be executed after this command Returns false by default, override this and return true
if your keyword causes a switch to a new FrameState,
eg.
Set the arguments for this action and verify their contents Override this if you need to perform syntax checking on
the arguments passed to your action