public static function getAttributeContent( eZContentObjectAttribute $contentObjectAttribute, eZContentClassAttribute $contentClassAttribute )
    {
        $rows = $contentObjectAttribute->content()->attribute( 'rows' );
        $target = array(
            'has_rendered_content' => false,
            'rendered' => null,
            'content' => array()
        );
        foreach( $rows['sequential'] as $elt )
        {
            $target['content'][] = $elt['columns'];
        }
        return $target;
    }