function IndexStub($pages)
 {
     parent::Fulltext_Index('ASCII');
     foreach ($pages as $page => $lexemes) {
         foreach ($lexemes as $lexeme) {
             if (!isset($this->lexemes[$lexeme])) {
                 $this->lexemes[$lexeme] = array();
             }
             $this->lexemes[$lexeme][] = $page;
         }
     }
 }
 function Book_Fulltext_Index($book_id)
 {
     global $internal_encoding;
     parent::Fulltext_Index($internal_encoding);
     $this->book_id = $book_id;
 }