Model Elements and Relationships in Sequence Diagrams

The UML sequence diagrams produced by the UML/SD Viewer illustrate program interactions with an emphasis on the chronological order of messages.

To learn about	See
Notation used to show when an instance (object or classifier role) is active	Activations
Model elements that represent roles played by classifiers participating in a collaboration	Classifier Roles
Notation used to show that an instance has been destroyed	Destruction Markers
Notation used to show the existence of an instance during an interaction	Lifelines
Model elements that represent communication between classifier roles	Messages
Model elements that represent instances of classifiers	Objects
Model elements that represent communication between objects	Stimuli
Non-standard model elements that represent thrown exceptions in C++	Exceptions
Model element that describes a role that a user plays when interacting with the system being modeled	Actors
Non-standard model elements that represent a loop in the execution of a program	Loops
Non-standard model elements that are used to represent synchronization points when multiple files are viewed together	Synchronizations
Model elements that represent miscellaneous information such as comments or user-defined messages	Notes