Sequence Diagram - Lifeline Notation

This section describes the Lifeline Notation used in a UML Sequence Diagram. A Lifeline Notation presents an object that participate message interchanges with other objects.

A Lifeline Notation is the primary graphical notation used in a UML Sequence Diagram to represent an object which participates message interchanges with other objects.

A Lifeline Notation is drawn as a rectangle shape with a vertical dash line attached to it and the object name placed inside the rectangle. The vertical dash line is usually referred as the "lifeline" of the object. Communication messages are recorded sequentially downward along the "lifeline".

For example, the "Web Server" object is participating message interchanges with other others. This object can be drawn as a Lifeline Notation in a UML sequence diagram as shown below:

UML Notation Shape - Lifeline
UML Notation Shape - Lifeline

Table of Contents

 About This UML Tutorial Book

 Introduction of UML (Unified Model Language)

 UML Class Diagram and Notations

 UML Activity Diagram and Notations

UML Sequence Diagram and Notations

 What Is a Sequence Diagram?

Sequence Diagram - Lifeline Notation

 Sequence Diagram - Message Notation

 Sequence Diagram - Execution Specification Notation

 Sequence Diagram - Frame Notation

 UML State Machine Diagram and Notations

 UML Use Case Diagram and Notations

 LibreOffice Drawing Extension - UML Elements

 MS Visio 2010 - UML Drawing Tool


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