1 SEQUENCE DIAGRAM
1 Sequence Diagram
Creating sequence diagrams with PlantUML is remarkably straightforward. This ease of use is largely
attributed to the user-friendly nature of its syntax, designed to be both intuitive and easy to remember.
• Intuitive Syntax:
First and foremost, users appreciate the straightforward and intuitive syntax that PlantUML employs.
This well-thought-out design means that even those new to diagram creation nd it easy to grasp the
basics quickly and without hassle.
• Text-to-Graphic Correlation:
Another distinguishing feature is the close resemblance between the textual representation and the graph-
ical output. This harmonious correlation ensures that the textual drafts translate quite accurately into
graphical diagrams, providing a cohesive and predictable design experience without unpleasant surprises
in the nal output.
• Ecient Crafting Process:
The strong correlation between the text and the graphical result not only simplies the crafting process
but also signicantly speeds it up. Users benet from a more streamlined process with fewer requirements
for time-consuming revisions and adjustments.
• Visualization While Drafting:
The ability to envisage the nal graphical outcome while drafting the text is a feature that many nd
invaluable. It naturally fosters a smooth transition from initial draft to nal presentation, enhancing
productivity and reducing the likelihood of errors.
• Easy Edits and Revisions:
Importantly, editing existing diagrams is a hassle-free process. Since the diagrams are generated from
text, users nd that making adjustments is considerably easier and more precise than altering an image
using graphical tools. It boils down to simply modifying the text, a process far more straightforward and
less prone to errors than making changes through a graphical interface with a mouse.
PlantUML facilitates a straightforward and user-friendly approach to creating and editing sequence dia-
grams, meeting the needs of both novices and seasoned designers alike. It skillfully leverages the simplicity
of textual inputs to craft visually descriptive and accurate diagrams, thereby establishing itself as a must-
have tool in the diagram creation toolkit.
You can learn more about some of the common commands in PlantUML to enhance your diagram creation
experience.
1.1 Basic Examples
In PlantUML sequence diagrams, the -> sequence denotes a message sent between two participants, which
are automatically recognized and do not need to be declared beforehand.
Utilize dotted arrows by employing the --> sequence, oering a distinct visualization in your diagrams.
To improve readability without aecting the visual representation, use reverse arrows like <- or <--.
However, be aware that this is specically for sequence diagrams and the rules dier for other diagram
types.
@startuml
Alice -> Bob: Authentication Request
Bob --> Alice: Authentication Response
Alice -> Bob: Another authentication Request
Alice <-- Bob: Another authentication Response
@enduml
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