How and where diagrams can be written

Each diagram description begins with the keyword @startuml then ends with the keyword @enduml or (@startXYZ and @endXYZ, depending of the kind of diagram).

You can refer to the PlantUML Language Reference Guide.

Those descriptions may be included into:

Of course, if you use HTML, LaTeX, APT or Java/C/C++ files, you should put diagram descriptions into comments.

File naming

By default, .png file have the same name as the source file used to generated them (only the extension changes).

An automatic sequence is added if a source file contains several instances of @startXXX.

It is possible to use a different file name for the generated file. For example:

@startuml image.png
Alice->Bob: Authentication Request
Bob-->Alice: Authentication Response
@enduml

In this example, the .png file will be named image.png.

(Please note that you should not use this feature with Word integration.)

Include with identifier [include]

You can declare some part of a file with an identifier (id=<identifier>), as:

Example with a file named file.pu:

@startuml(id=TAG1)
Alice->Bob : TAG1
@enduml

@startuml(id=TAG2)
Alice->Bob : TAG2
@enduml

Then you can include, on one another file, one id part with !include <filemane>!<id> command:

@startuml
!include file.pu!TAG2
Alice->Bob : hello
@enduml

The corresponding generated output will be:

๐ŸŽ‰ Copied!
@startuml
Alice->Bob : TAG2
Alice->Bob : hello
@enduml

[Ref. QA-4467]

Include with definition identifier (on the same file) [includedef]

You can declare definition (def) some part on a file with an identifier between the tags @startdef(id=<identifier>) and @enddef.

Then you can include, on the same file, only one definition part with !includedef <identifier> command.

Example on a file named file.pu:

๐ŸŽ‰ Copied!
@startdef(id=macro_def_id)
Alice -> Bob : hello1
@enddef

@startuml
!includedef macro_def_id
Alice -> Bob : hello2
@enduml

Then the corresponding generated output will be file_001.png, as:

๐ŸŽ‰ Copied!
@startuml
Alice -> Bob : hello1
Alice -> Bob : hello2
@enduml

[Ref. QA-5769]

Adding options for other tools

You can add options, for other tools, enclosed by { and }.

Only the first (<filename>) is relevant for PlantUML, the others are just skipped, and can be use by other tools.

@startuml{filename.png, This is my other caption text, width=16cm, option_for_other_tools=value}

@enduml

[Ref. QA-1466]