How open are open systems?

In my post “LING – Library integration next generation” I mentioned Marshall Breedings presentation at TICER “Library Automation Challenges for the next generation”.Besides “Moving toward new generation of library automation” one of his other two topics was “A Mandate for Openness”, about Open Source, Open Systems, Open Content.Marshall Breeding distinguishes five types of Open Systems, three of which in my view are the most important: Closed Systems:  black boxes, only accessible via the user interfaces […]