the element you have marked are local element of the specific workflow, so the meaning is what you or whom ever created the workflow do with them.
BUS0050 is a funds transfer document and it's transferred to the wi-object_id so the task is a method for that object.
the other container elements such as the agents are probably for the task description, but they are meaningless by themselves they need to be imported form an earlier task. or they are created on the method the task is based on and how it was implemented (e_doc_changed for example)