MIL-STD-2301 Computer Graphics Metafile Cgm Implementation Standard For The National Imagery Transmission Format StandardThis standard establishes the requirements necessary to implement Computer Graphics Metafiles CGM used for the representation of symbol graphics in the National Imagery Transmission Format Standard NITFS.

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MIL-STD-2301A

5.2.1.2.7  Picture Descriptor elements position for output.  The CGM implementation for NITFS shall generate all Picture Descriptor elements after the Begin Picture element and before the Begin Picture Body element.

5.2.1.2.8  Attribute elements position for output.  The CGM implementation for NITFS shall generate any Attribute Element after the Begin Picture Body element and before the Graphical Primitive element to which it applies.

5.2.1.2.9  Graphical Primitive elements position for output.  The CGM implementation for NITFS shall generate any Graphical Primitive elements after the Begin Picture Body element and any associated Attribute elements for that Graphical Primitive element and before the End Picture element.

5.2.2  CGM element functional requirements.

5.2.2.1  CGM element functional input requirements.

5.2.2.1.1  CGM input required elements.  The following CGM elements are required for each CGM that the CGM implementation for NITFS inputs and interprets:

a.  Begin Metafile

b.  Metafile Version

c.  Metafile Element List d.  Metafile Description e.  Begin Picture

f.  Color Selection Mode g.  VDC Extent

h.  Begin Picture Body i.  End Picture

J.  End Metafile.

5.2.2.1.2  Metafile Description element contents required for input.  The CGM implementation for NITFS

shall be able to input and interpret the Metafile Description element that contains the following substring: NITF/CGM-APP-2.0 for CGM placed in NITF2.0 and/or NITF2.1 files.

And additionally, for NITF2.1 files only:

NITF/CGM;ProfileEd:2301-2/Source:producer;Date:YYYYMMDD"

Where 'producer' is the application name and release/version of the application producing or modifying the

CGM.  The date shall reflect the creation date or more recent date of modification.

5.2.2.1.3  Length of parameter strings required for input for the Begin Metafile, Begin Picture, and Metafile Description elements.  The CGM implementation for NITFS shall be able to input and interpret the Begin Metafile, Begin Picture, and Metafile Description elements with parameter strings of at least 1024 characters.

5.2.2.1.4  Length of parameter strings required for input for the Font List element. The CGM implementation for NITFS shall be able to input and interpret the Font List element with parameter strings of at least 1024 characters.

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