SDL controller semantic

The documentation mentioned that if a joystick is recognised by SDL I can get all buttons/axis semantic info. But there is no example provided. How can I do that?

https://www.libsdl.org/release/SDL-1.2.15/docs/html/guideinput.html
this may not be current, but SDL tends not to update too often.
As for how do we get there? the input system
hey man, if you have input hassles, im here to doublecheck you, its totally cool, I need it too