Multiple extensibility action scripts running sequentially. 

version: "1"
flow:  
 flow_start: 
  next: action1  
action1:  
  action: <action_name>   
  next: action2  
action2:  
  action: <action_name>  
  next: flow_end
Note: You can loop back to a previous action by assigning it as the next: action. For instance, in this example, instead of next: flow_end, you can enter next: action1 to rerun action1 and restart the sequence of actions.

The sequential action flow has one action element directly leading into another action element.