UML Sequence Diagram Objects

UML Sequence Diagram objects and their usage
This is an overview of the basic drawing elements that you will use when drawing Sequence diagrams. All these objects are available in Creately and you can try out a demo or take a look at some sample UML Sequence Diagrams for more context.

The object notation of a UML Sequence Diagram is a rectangle with it's lifeline (a dashed line) descending from the center of its bottom edge. This element represents the life span of the object during the scenario being modeled.

Activation elements in the UML Sequence Diagram are boxes on the lifelines. These are also called the method-invocation boxes, and indicate that an object is responding to a message. It starts when the message is received and ends when the object is done handling the message.

Destroy object in a UML Sequence Diagram is a X at the bottom of an Activation box. This is a UML convention to indicate an object has been removed from memory.

Comment object in a UML Sequence Diagram and UML Activity Diagram is shown in a rectangle with a folded-over corner. To relate the comment to any object on the diagram, the comment has to be connected to the object with dashed lines.

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