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A comment on The Unreasonable Effectiveness of Sequence Diagrams in MermaidJS. Parent comment

Re:The Unreasonable Effectiveness of Sequence Diagrams in Me... by zelphirkalt on Monday July 24, 2023 @11:47AM (#36849857)
It does look nice, and covers most things, except for life lines. Is there a way to add life lines?

And why do so many tools choose to ignore life lines and provide incomplete sequence diagrams? Perhaps it gets really complicated to express in such a simple way as the examples do?

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Re:The Unreasonable Effectiveness of Sequence Diagrams in Me... by quietbritishjim on Monday July 24, 2023 @12:05PM (#36850158)
It has those! They're under "Lifeline Activation and Destruction" on that page:

https://plantuml.com/sequence-diagram#5cc0040514e70f7b

You can even have two active on the same lane at the same time, as shown in the second example on that page.

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