To show two or more alternatives, the larger rectangle is then divided into what is called interaction operands using a dashed line, as shown in the sequence diagram example above. The alternative fragment is represented by a large rectangle or a frame it is specified by mentioning ‘alt’ inside the frame’s name box (a.k.a. The alternative combination fragment is used when a choice needs to be made between two or more message sequences.
This - the fragment operator - specifies what sort of a fragment it is. On the top left corner of the fragment sits an operator. It is used to show complex interactions such as alternative flows and loops in a more structured way. Manage complex interactions with sequence fragmentsĪ sequence fragment is represented as a box that frames a section of interactions between objects (as shown in the examples below) in a sequence diagram.Note: View Sequence Diagram Best Practices to learn about sequence fragments. Each object has a column and the messages exchanged between them are represented by arrows.Ī Quick Overview of the Various Parts of a Sequence Diagram Sequence Diagram NotationsĪ sequence diagram is structured in such a way that it represents a timeline which begins at the top and descends gradually to mark the sequence of interactions. In simpler words, a sequence diagram shows different parts of a system work in a ‘sequence’ to get something done. They illustrate how the different parts of a system interact with each other to carry out a function, and the order in which the interactions occur when a particular use case is executed. Sequence diagrams, commonly used by developers, model the interactions between objects in a single use case. Among the three, sequence diagrams are preferred by both developers and readers alike for their simplicity. These diagrams are used to illustrate interactions between parts within a system. There are 3 types of Interaction diagrams Sequence diagrams, communication diagrams, and timing diagrams.
#Drawing sequence diagram online how to#
This sequence diagram tutorial is to help you understand sequence diagrams better to explain everything you need to know, from how to draw a sequence diagram to the common mistakes you should avoid when drawing one.
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