Modeling the sequence of messages between objects in an interaction in UML

In UML models, an interaction is a behavior that represents communication between one or more participants. A sequence diagram is a UML interaction diagram that models the messages that pass between participants, such as objects and roles, as well as the control and conditional structures, such as combined fragments. You can create new sequence diagrams, populate existing sequence diagrams with source elements, add lifelines, messages, and combined fragments to sequence diagrams.

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