/**
     * Retrieve multiple objects by pkey.
     *
     * @param      array $pks List of primary keys
     * @param      Connection $con the connection to use
     * @throws     PropelException Any exceptions caught during processing will be
     *       rethrown wrapped into a PropelException.
     */
    public static function retrieveByPKs($pks, $con = null)
    {
        if ($con === null) {
            $con = Propel::getConnection(self::DATABASE_NAME);
        }

        $objs = null;
        if (empty($pks)) {
            $objs = array();
        } else {
            $criteria = new Criteria();
            $criteria->add(ElementTaskRelationPeer::ETR_UID, $pks, Criteria::IN);
            $objs = ElementTaskRelationPeer::doSelect($criteria, $con);
        }
        return $objs;
    }