Convert a character to a plantuml object.
This can be plotted.
# S3 method for default
as.plantuml(x, complete = FALSE, nm = NULL, ...)character sting containing plantuml code.
if TRUE, enclose the plantuml statements in "@startuml" and "@enduml"
normally not for user - TODO I have to check... embarassing
additional arguments - not used here
object of class plantuml which can be plotted.