I saw on a video that sometimes life line in sequence diagram can be solid but the author doesn't explain more this point.
I searched more in the net but i don't find more response.
I saw on a video that sometimes life line in sequence diagram can be solid but the author doesn't explain more this point.
I searched more in the net but i don't find more response.
According to section 17.3.4.1 of 2.5 UML specification:
As you can see it's up to you if you use solid or dashed lifeline. However indeed dashed line is more popular.
The only thing I would recommend is being consistent across a single model (if you use dashed line use it for all lifelines in a particular model, and definitely for particular diagram).