SE450: UML Sequence Diagrams [3/16]

These show the evolution of a system over time.

         +------------+
         | <<static>> |
         |  SFactory  |
         +------------+
    newS()      |
-------------->+-+  new()   +-----+
               | |--------->| x:S |
               | |          | --- |
               | |          +-----+
               | |  x         | |
   x           | |<- - - - - -+-+
<- - - - - - - +-+             |
                |              |
                |              |
                |              |