How to Model Gates in UML Sequence Diagrams

To pass a message between two sequence diagrams in UML modeling, we can make use of gates. Through modeling gates, we could relate the message outside an interaction fragment with message inside another interaction fragment.

Graphically a gate, with an arrowed line, connects to the sequence diagram’s frame edge with one end and the other end connected to a lifeline.

In this tutorial we will show you how to model gates in sequence diagrams using Visual Paradigm for UML (VP-UML).

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