function Version()
	{
		$ver = (is_null($this) ? XDB_VERSION : $this->version);
		$str = sprintf("%s/%d.%d", XDB_TAGNAME, ($ver >> 5), ($ver & 0x1f));
		if (!is_null($this)) $str .= " <base={$this->hash_base}, prime={$this->hash_prime}>";
		return $str;
	}