code: private Ref xorOp() throws PageException {
  	Ref ref = orOp();
  	while (cfml.forwardIfCurrent("xor")) {
  	    cfml.removeSpace();
  	    ref = new Xor(ref, orOp(), limited);
  	}
  	return ref;
      }
docs: Transfomiert eine Xor (xor) Operation. <br />
  EBNF:<br />
  <code>orOp {"xor" spaces  orOp};</code>
  
  @return CFXD Element
  @throws PageException