Sequence Diagram
A sequence diagram displays an interaction as a two-dimensional chart. The vertical dimension is the time axis; time proceeds down the page. The horizontal dimension shows the roles that represent individual objects in the collaboration. Each role is represented by a vertical column containing a head symbol and a vertical line—a lifeline. During the time an object exists, it is shown by a dashed line. During the time an execution specification of a procedure on the object is active, the lifeline is drawn as a double line.
In general, a sequence diagram shows only sequences of messages and not exact time intervals. A timing diagram can be used when metric time is important, but for understanding the semantics of interactions, ...
Get Unified Modeling Language Reference Manual, The, Second Edition now with the O’Reilly learning platform.
O’Reilly members experience books, live events, courses curated by job role, and more from O’Reilly and nearly 200 top publishers.
