code: public XObject operate(XObject left, XObject right)
            throws javax.xml.transform.TransformerException
    {
      return (left.notEquals(right)) ? XBoolean.S_TRUE : XBoolean.S_FALSE;
    }
docs: Apply the operation to two operands, and return the result.
  
  
  @param left non-null reference to the evaluated left operand.
  @param right non-null reference to the evaluated right operand.
  
  @return non-null reference to the XObject that represents the result of the operation.
  
  @throws javax.xml.transform.TransformerException