Sequence diagrams

Sequence diagrams are very useful to represent the dynamic behavior of a system, for instance a sequence of instructions in a code. Objects are represented with their lifelines, by considering time as a continuous quantity and not as a discrete quantity. As a result, you should not have to care about lifelines lengths. To manage this specific behavior, elements of your sequence diagrams will be defined within a specific environment: umlseqdiag. This is the main difference with the other diagrams you can draw with TikZ-UML.