What is reference in sequence diagram?

An interaction occurrence (or reference sequence diagram) enables you to refer to another sequence diagram from within a sequence diagram. This functionality enables you to break down complex scenarios into smaller scenarios that can be reused.

What is ref in UML diagram?

ref Reference: refers to an interaction defined on another diagram. The frame is drawn to cover the lifelines involved in the interaction. You can define parameters and a return value. sd Sequence diagram: used to surround an entire sequence diagram. Massimo Felici.

How do you present a sequence diagram?

Lifeline Notation A sequence diagram is made up of several of these lifeline notations that should be arranged horizontally across the top of the diagram. No two lifeline notations should overlap each other. They represent the different objects or parts that interact with each other in the system during the sequence.

What are the components of sequence diagram?

Basic Sequence Diagram Notations

• Class Roles or Participants. Class roles describe the way an object will behave in context.
• Activation or Execution Occurrence. Activation boxes represent the time an object needs to complete a task.
• Messages.
• Lifelines.
• Destroying Objects.
• Loops.
• Synchronous Message.
• Asynchronous Message.

What is ALT in sequence diagram?

alt is used to describe alternative scenarios of a workflow. Only one of the options will be executed. opt is used to describe optional step in workflow. For example, for online shop purchase sequence diagram you may use opt to describe how user can add gift wrapping if she wishes.

What does Alt mean in sequence diagram?

alternative scenarios
alt is used to describe alternative scenarios of a workflow. Only one of the options will be executed. opt is used to describe optional step in workflow. For example, for online shop purchase sequence diagram you may use opt to describe how user can add gift wrapping if she wishes.