{ collection_name.EXISTS ( index )
| { cursor_name
  | cursor_variable_name
  | :host_cursor_variable_name
  | SQL
  } % { FOUND | ISOPEN | NOTFOUND }
| expression { relational_operator expression
             | IS [ NOT ] NULL
             | [ NOT ] { LIKE pattern
                       | BETWEEN expression AND expression
                       | IN ( expression [, expression ]... )
                       }
}