This is interesting and I think you're right that language interop will be important. I think .NET has a CLS (common language specification) profile that defin

This is interesting and I think you're right that language interop will be important. I think .NET has a CLS (common language specification) profile that defines a minimal subset you can design your API against and be confidant the other languages will be able to call your API. For example, VB symbols are case insensitive or something like that -- the CLS checker will complain if you design your API in C# with overloaded methods of different case. Does the JVM need some least-common-denominator thing like this? I just remembered -- the JavaFX stack is being rewritten as a language agnostic API. I wonder how they are designing that API.