Welcome to PlantUML! You can start with a simple UML Diagram like: Bob->Alice: Hello Or class Example You will find more information about PlantUML syntax onhttps://plantuml.com (Details by typinglicensekeyword) PlantUML 1.2024.4beta6[From string (line 9) ] @startuml!unquoted function OBJ(){{class Object {name : tokenname : flag}}}!endfunctionThis function does not have any !return directive. Declare it as a procedure instead ?