Type: Metafile
    Extension: CGM
      Version: 
  Compression: None
  Color Depth:
   Maintainer: ANSI, ISO, IEC, DOD, NIST
Specification:

The current version of the CGM ANSI/ISO standard (commonly called 
CGM:1992) is:

  Information Processing Systems--Computer Graphics Metafile for the
  Storage and Transfer of Picture Description Information, 
  ANSI/ISO 8632-1992.

This standard superseded the early CGM:1986 (ANSI X3.122-1986) ANSI
standard. The CGM standard is contained in four ISO standards documents:

  ISO/IEC 8632-1:1992 Part 1: Functional Specification
  ISO/IEC 8632-3:1992 Part 2: Character Encoding
  ISO/IEC 8632-3:1992 Part 3: Binary Encoding
  ISO/IEC 8632-4:1992 Part 4: Clear Text Encoding

These documents may be obtained from the following organizations:

  International Standards Organization (ISO)
  1 rue de Varembe
  Case Postal 56
  CH-1211 Geneva 20 Switzerland
  Voice: +41 22 749 01 11
  Fax:   +41 22 733 34 30

  American National Standards Institute (ANSI)
  Sales Department
  11 West 42nd Street
  New York, NY 10036
  Voice: 212.642.4900

  Canadian Standards Association (CSA)
  Sales Group
  178 Rexdale Blvd.
  Rexdale, Ontario, M9W 1R3
  Voice: 416.747.444

And here are a few CGM Web pages:

  MIL-STD-2301, CGM Implementation Standard for the NIST Format Standard
  http://www.tasc.com/nitfs/NITFS_docs.html

  CGM Home Page at NIST
  http://speckle.ncsl.nist.gov/~lsr/cgm.htm

  Overview of CGM Standards
  http://speckle.ncsl.nist.gov/~lst/cgm_std.htm

  The Computer Graphics Metafile (CGM)
  http://www.agocg.ac.uk:8080/agocg/CGM.html

A freely available C library for creating CGM files is available at:

  http://speckle.ncsl.nist.gov/~lorax/cgm/cd.html