I was exposed to files with a .fidl extension for the first time a few years ago as part of a project that used the Franca framework for IPC. Recently, I was spelunking around Google's Fuchsia project and learned that it, too, uses 'FIDL files' for IPC, see:
My question is: are these FIDL variants related in any way, i.e., do they share a common genesis, or... is a complete coincidence that "Fuchsia IDL" and "Franca IDL" both abbreviate to "FIDL"?
Somebody answered my question in the Franca Google Group: Franca's FIDL files and Fuchsia's FIDL files are completely unrelated. It's just a coincidence that they have the same extension, and a similar purpose.