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It is indicated by a dashed vertical line which is started from the
actor and system. Aside from that, it also means the activation of a
sequence life.
4.
Activation Bars
The specific bar means an active period of the current running
interaction. It is symbolized by a bar below the lifeline.
5.
Input Messages
Input messages are illustrated by horizontal arrows which start from
actor to system that indicate input messages to destination class. The
provision of the UML for creating and sending message is to start
the first word with a lowercase letter and affix the following words
with an
initial uppercase letter without space. In case there are two
or more parameters within single message, they should be separated
by a coma.
6.
Output Messages
Horizontal arrow that is symbolized as output messages has the start
point from system and finish point at actor. The main purposes of
output messages are to represent a response message towards actor.
In addition, they are shown as dashed lines instead of straight line
like input messages.
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