2.7.1 Condition to Check


Specify an expression that can be evaluated and produces a "true" or "false" result.

The expression must be syntactically correct. Expression evaluation is left to right within brackets, so use brackets whenever in doubt as to the order in which the expression will be evaluated. Expression components are checked for type and length compatibility. Error messages are issued that indicate any problems found when attempting to evaluate the expression.



Components of the expression can be: