I'm designing some Sequence Diagrams for my project and decided to divide login and register use cases, creating two different diagrams (thought was a wise choice to separate concerns and simplify).
Now, when Register process is finished, I would like to tell the diagram to follow some path inside Login Diagram. Is that what Lost message is for? Like calling an event outside the diagram? Please clarify.
This is a Gate. UML 2.5 Specs:
17.4.4.3 Gate
Gates are just points on the frame, the ends of the messages. They may have an explicit name (see Figure 17.4).
17.12.9 Gate [Class] 17.12.9.1 Description
A Gate is a MessageEnd which serves as a connection point for relating a Message which has a MessageEnd (sendEvent / receiveEvent) outside an InteractionFragment with another Message which has a MessageEnd (receiveEvent / sendEvent) inside that InteractionFragment.
