XOR(b1, b2, ...)
XOR implements the logical exclusive OR function: the result is TRUE if an odd number of the values evaluated to TRUE.
b1 through bN are expressions that should evaluate to TRUE or FALSE. If an integer or floating point value is provided, zero is considered FALSE and anything else is TRUE.
XOR(TRUE,FALSE) equals TRUE.
XOR(3>4,4<3) equals FALSE.