I think you're referring to the distinction between staatsrecht/constitutional law (i.e. we're a monarchy, have a parliament, provinces and whatnot) and the other areas of law. Every country in the world has this, so I was confused about your statement.

Is this about that theory of Wilhelmina not being a real daughter of Willem III? Can't say that I care either way, they could be descended of Moses himself and I'd still be against the monarchy.