@startuml !$az = "Hello" !$bz = %upper($az) !function $bold($a) return "<b>" + $a + "</b>" !function $lower($a) return %lower($a) User -> Processor ++ #green : Submit variable value: $bold($az) Processor -> Processor : Process request. return Results:\nUpper Case is: $bold($bz), and\nLower Case is: $bold($lower($bz)). @enduml Submit amiga aws-orange black-knight bluegray blueprint cerulean-outline cerulean crt-amber crt-green cyborg-outline cyborg hacker lightgray mars materia-outline materia metal mimeograph minty plain reddress-darkblue reddress-darkgreen reddress-darkorange reddress-darkred reddress-lightblue reddress-lightgreen reddress-lightorange reddress-lightred sandstone silver sketchy-outline sketchy spacelab spacelab-white superhero-outline superhero toy united vibrant       🎉 Discover the future PlantUML Web Editor! 🚀  PNG  SVG  ASCII Art