How to add notes/loop-messages at the same level in a sequence diagram?

Question

Hello.  I may have two participants: Server and Client.

I would like to add a note over each participant, but at the same level.  So as an example,

@startuml

participant Server

participant Client

note over Server

    Initializing publication.

end note

note over Client

    Initializing subscription.

end note

Server -> Client : A publication.

@enduml

In the above example, I'd like the two notes to be on the same 'horizon-level'.  Also, instead of messages, perhaps I want to show that the initialization happens at the same time:

    Server->Server : Initialize publication.

    Client->Client : Initialize subscription.

Thanks, and keep up the good work!!

Answer 1

Is this what you are looking for?

http://www.plantuml.com/plantuml/uml/bP0nhW8n34Hxdy87-9y3KA1TgAWvGJPOC59meiIXuFGOiHGH5MuiZ-RDI9wQXMhzbgZuHaG9QZmdH1cKazIxr47QvsMu3mcYDahNK26asOIpyslCtyTBx7DK64B20thXqXVl3eQi6oBHCxzW-YMYzQN5YlALyIRvVxUolELvB9pSxBzu0W00

Answer 2

Hello P. F.,

Just to answer to an old quasi-unanswered question (and point out similar question/answers).

Here are some answers:

• https://forum.plantuml.net/354/sequence-diagram-possibly-multiple-hnotes-vertical-level

With that, we observe the expected result:

/note over Client
    Initializing subscription.
end note

Regards,
Th.