This code illustrates a minor bug(?)
@startuml
class Operation << (H,#E6FFE6) >> {
__todo/fixme__
-is_abstract [[ blaha(xyz,12) { tooltip } ]]
}
@enduml
The visibility symbol in front of "is_abstract" is a red filled square, whereas I expected the square not to be filled (edges only). It's the "()" inside the "[[]]", which makes the square filled.
http://www.plantuml.com/plantuml/img/7Oqn2eD054HxJp6GHi4Gai9An4P9bmE8B5_Ta8NLBxi_O2BUNTtfvZ6FARsGa-ze8npfBNcFrwmTYU49UOxucLwghAwhB06A0ciOAYKyyErjbb4h5H2knYlgl3ZgvQXDWyxIX-Bbzq_lZmGhXDcAcR6XROEpHIZrD9ptEm00
Above, I tried to make a short example. In my code I use [[]] to include hyperlinks, which in the MATLAB IDE opens the source code file at the appropriate line. (A bit like in https://www.youtube.com/watch?v=QjwXITp6fwg)