Description of the illustration other_boolean_form.eps

{ collection.EXISTS ( index )
| expression { IS [ NOT ] NULL
             | [ NOT ] { BETWEEN expression AND expression
                       | IN ( expression [, expression ]... )
                       | LIKE pattern
                       }
             | relational_operator expression
             }
| { named_cursor | SQL } % { FOUND | ISOPEN | NOTFOUND }
}