He's asking about compatibility between derailleurs and shifters.
The article is about the compatibility between cassettes, which I thought was pretty well known.
There's some Srampagnolo and Shimergo setups out there, but I think it's usually 8- or 9-speed stuff.
11s stuff should work across brands, according to this http://www.velonews.com/2013/09/bikes-and-tech/drivetrain-compatibility-hidden-in-plain-sight_303199