[pestaa]

Oh really? http://json-schema.org/

The industry seems to be going in circles. 15 years from now the new kids will hate JSON and hate JSON schema and all the complex JSON toolchain, and so they will reinvent the wheel.

[mqsiuser]

who knows of it, who uses it ?

There may be like circles (ofc... the circle of live ;), but not the same (different things are different :)