CGM标准文档，可以参考此标准文档对CGM的元素进行了解并尝试使用此文档进行软件开发和解析CGM等工作-Information technology — Computer graphics — Metafile for the storage and transfer of picture descr iption information — Part 3: Binary encoding Technologies de l information — Infograph

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CAD Import VCL is a set of powerful classes that can be used in applications that give users ability to view and operate with DWG/DXF/DWF/HPGL/HPGL2/SVG/CGM files. CAD Import VCL provides an API for using AutoCAD® DWG™ /DXF™ , Auto