[fw-db] Zend DB -> tables relations

Hi another time,

I'm sorry about insistence, but i can't understand why we need to create things like :  

'Reporter' => array(

            'columns'           => 'reported_by',
            'refTableClass'     => 'Accounts',
            'refColumns'        => 'account_name '
        ), here.

Here is my example:

class News extends Zend_Db_Table_Abstract

{

    protected $_name = 'news';

    protected $_primary = 'ID';

}

class CatNews extends Zend_Db_Table_Abstract

{

    protected $_name = 'catnews';

    protected $_primary = 'ID';

    protected $_dependentTables = array('news');

}

How can i represent here, my foreign keys? This is the only things that i need?

Thanks in advance!