Angle definition in the MOTOR_LIB

Hello

I'm looking for a definition of "int16_t angle" argument in the method:
int32_t MOTOR_LIB_ParkTransform (int32_t i_alpha, int32_t i_beta, int16_t angle, int32_t *iq)

What unit is used there and how it is scaled ?
Is there any well documented API doc for this APP ? DAVE help doesn't provide such informations.

Thanks for help,
Mariusz