Mercator
// Specification of Object Reference Model (ORM)
SRM_HORIZONTAL_DATUM_ENUM horizontal_datum
// Specification of Projection Basis
SRM_FLOAT64 geodetic_longitude // degrees; specifying the meridian
// of the Y axis (positive northwards)
SRM_FLOAT64 central_scale_factor // unitless; normally close to (<=)1.0
// Origin of Coordinate System
// Origin Displacement of Coordinate System
SRM_FLOAT64 x_offset // origin relative displacement in X
SRM_FLOAT64 y_offset // origin relative displacement in Y
SRM_FLOAT64 x // meters; positive eastward
SRM_FLOAT64 y // meters; positive northward