Section 8,5,3: Logical

 Logical expressions may contain logical and integer data such as
 variables, record elements, array elements, constants, function
 references, expressions enclosed in parentheses, and relational
 expressions.  The expression evaluates to a logical value using the
 following operators:


       OPERATOR         PRECEDENCE
       **               First (Highest)
       *,/              Second
       +,-,//           Third
       Relational
         Operators      Fourth
       .NOT.            Fifth
       .AND.            Sixth
       .OR.             Seventh
       .XOR.            Eighth (Lowest)
       .NEQV.           Eighth
       .EQV.            Eighth