In UML activity diagrams, what does an object node model?

In UML activity diagrams, what does an object node model?

• A. The flow of object tokens
• B. The control flow between actions
• C. The input stream
• D. The output stream

Answer: (A)

Object nodes in UML activity diagrams represent where objects (data instances) flow through the activity. They hold or create objects and are the places where an object token resides as it moves along the object flow to the next action. This focuses on data moving through the workflow, not on the order of actions. Control flow between actions is handled by control edges and control nodes, which govern sequencing and branching. So object nodes specifically model the movement and state of objects as they are produced, consumed, or transformed by actions, illustrating the flow of object tokens through the activity. For example, when a process creates a Customer object and passes it to a validation step, the Customer object token sits in the relevant object node and moves along to the next action.

Object nodes in UML activity diagrams represent where objects (data instances) flow through the activity. They hold or create objects and are the places where an object token resides as it moves along the object flow to the next action. This focuses on data moving through the workflow, not on the order of actions.

Control flow between actions is handled by control edges and control nodes, which govern sequencing and branching. So object nodes specifically model the movement and state of objects as they are produced, consumed, or transformed by actions, illustrating the flow of object tokens through the activity. For example, when a process creates a Customer object and passes it to a validation step, the Customer object token sits in the relevant object node and moves along to the next action.