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PlantUML Language specification Sub-diagram

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Sub-diagram

On PlantUML, you can mix all diagram type and make sub-diagram.

To activate this feature, the sub-diagram must:

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Basic example

Here is a basic example of sub-diagram, with adding an Activty diagram on a note on a Class diagram:

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@startuml
abstract ATest {
  {static} +String id
  {abstract} -void doit()
}

class Test {
  -int count
  -int max
  -int increment
  -void doit()
}

ATest <|-- Test

note right of Test::doit()
{{
  skinparam backgroundcolor transparent
  start

  while (count < max?)
    :count = count + increment;
  endwhile

  stop
}}
end note
@enduml

[Ref. QA-6947]

By default the background color of a sub-diagram is white. This can be solved by adding skinparam Backgroundcolor transparent to the sub-diagram.

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@startuml
rectangle A [
{{
    rectangle A
}}
]

rectangle B [
{{
    skinparam Backgroundcolor transparent
    rectangle B
}}
]
@enduml

Besides being used in other elements or notes, they can also be used in messages. For this, the sub-diagram must be all on one line:

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@startuml
(A) --> (B): \tSub-diagram in a message\n{{\n(C)->(D)\n}}
@enduml

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Inheritage of handwritten skinparam

Sub-diagram can only herite of the handwritten skinparam from the hosted diagram, as:

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@startuml
!option handwritten true
	component a {
	}
	note left of a
		handwritten is OK
	end note
	
	note right of a
		{{
			a->b:test
			note right
				handwritten is inherited
			end note
		}}
	end note
@enduml

[Ref. QA-9043]

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Collection of all ref. of sub-diagram: