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PlantUML in a nutshell

PlantUML is a component that allows you to quickly write:

• Sequence diagram
• Usecase diagram
• Class diagram
• Object diagram
• Activity diagram (here is the legacy syntax)
• Component diagram
• Deployment diagram
• State diagram
• Timing diagram

The following non-UML diagrams are also supported:

• JSON data
• YAML data
• Extended Backus-Naur Form (EBNF) diagram
• Network diagram (nwdiag)
• Wireframe graphical interface or UI mockups (salt)
• Archimate diagram
• Specification and Description Language (SDL)
• Ditaa diagram
• Gantt diagram
• MindMap diagram
• Work Breakdown Structure diagram (WBS)
• Mathematic with AsciiMath or JLaTeXMath notation
• Entity Relationship diagram (IE/ER)

Furthermore:

• Hyperlinks and tooltips
• Creole: rich text, emoticons, unicode, icons
• OpenIconic icons
• Sprite icons
• AsciiMath mathematical expressions

Diagrams are defined using a simple and intuitive language. (see PlantUML Language Reference Guide).

New users can read the quick start page. There is also a F.A.Q. page. PlantUML can be used within many other tools.

Images can be generated in PNG, in SVG or in LaTeX format. It is also possible to generate ASCII art diagrams (only for sequence diagrams).

Example: (You can edit the text if you want, the diagram will be dynamically updated!)	describes the following diagram :
Bob->Alice : Hello!

This example is working thanks to the online demo server.