DWG NO Drawing NO 图纸编号
Using a few handy open source libraries, you can make your applications able to natively read DXF and DWG files on any operating system at no cost.
借助几个便捷的开源库，您的应用程序就可以读取任何操作系统上的DXF和DWG文件，并且不产生任何成本。
No other formats discussed in this article— DXF, DWG, and KML— have this restriction.
而本文中所讨论的其他格式 DXF、DWG 和 KML 均没有这个限制。
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