.PLANTUML File Extension
What is a PLANTUML file?
File created by PlantUML, a UML diagram creator used within programs like Sublime Text Editor or programming language like HTML; same as the .PU file; contains code referenced by PlantUML to create diagram images that can be generated as .PNG or .SVG files; creates sequence, use case, class, activity, component, state, and object diagrams.
An example of the syntax used by the PLANTUML file for an object diagram:
Chair --|> Table : furniture
This example would create a diagram of two objects named Chair and Table with a line and arrow pointing from the chair to the table. Also, the word furniture would appear as a label in the middle of the line that connects the two objects. The @startuml line begins the comment and the @enduml line ends the comment.
NOTE: PlantUML is downloaded as a .JAR file, consult the PlantUML link below for how to run the tool.