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The keyword xor performs a logical operation which returns the value true if one of its operands is true; it returns the value false if both operands are false or if both operands are true.
Related keywords:
| xor | 
Example 1:
const boolean c_goed := true;  
const boolean c_tvaertom := true;  
var boolean v_ensemble := c_goed xor c_tvaertom; 
The varaible v_ensemble will have the initial value false.
BNF definition of xor