public function getTableMeta($className) {
        $tableMeta= null;
        if ($className= $this->loadClass($className)) {
            if (isset ($this->map[$className]['tableMeta'])) {
                $tableMeta= $this->map[$className]['tableMeta'];
            }
            if (!$tableMeta && $ancestry= $this->getAncestry($className)) {
                foreach ($ancestry as $ancestor) {
                    if (isset ($this->map[$ancestor]['tableMeta'])) {
                        if ($tableMeta= $this->map[$ancestor]['tableMeta']) {
                            break;
                        }
                    }
                }
            }
        }
        return $tableMeta;
    }