Returns true if only one of two specified expressions is true, false otherwise.
xor( expression1, expression2 )' boolean value
expression1 xor expression2 boolean value
expression1, expression2
Boolean values.
These examples illustrate the possible values for XOR.
xor(true, false) %Returns true
xor(false, true) %Returns true
xor(false, false) %Returns false
xor(true, true) %Returns false