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   The parenthesis are used to set the precedence of the operations that must
   be performed in order to build the query expression. Elements enclosed in
   parenthesis will be computed first. The available parenthesis are:

     . ( - Opening

     . ) - Closing

Example:

   The expression computed in the above example will be:

   (Field1>=999 .AND. Field2<=999) .OR. Field3=XXXXXX