CGM File Format
Because CGM is such a powerful format it is a major undertaking for a software developer to implement the entire standard, and thus various subsets of the standard ("profiles") have been defined including WebCGM which is intended for use on the Internet.
Another issue with CGM is that (for example) typefaces are referenced by name, by what those names mean in terms of the display to be generated, is not well-standardized. This type of thing can lead to issues when transfering CGM files between software-applications or computers.
CGM files can be stored in a reasonably compact binary format, or in a clear text format which is intended to be readable and writable using a text editor.
A technical discussion of this format can be found in Chapter 27 of Graphics File Formats† by David C. Kay and John R. Levine.
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