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  Construct:    Sign Condition
 
  Function:     Tests sign of data item
 
  Syntax:       Which format?  ◄Relation Condition►  ◄Class Condition►
                                Sign Condition       ◄Pointer Condition►
 
  ►►──arithmetic-expression──┬──┬─┬─────┬─┬─POSITIVE─┬─────►◄
                             └IS┘ └─NOT─┘ ├─NEGATIVE─┤
                                          ├─ZERO─────┤
                                          ├─ZEROS────┤
                                          └─ZEROES───┘
                                    -♦-