NBN EN 28632-4 : 94 AMD 1 96

1 Scope
2 Normative references
3 Notational conventions
4 Entering and leaving the metafile environment
4.1 Generic clear text and instantiations
4.2 Implicitly entering the metafile environment
4.3 Designating and invoking the CGM coding
       environment from ISO 2022
5 Metafile format
5.1 Character repertoire
5.2 Separators
5.2.1 Element separators
5.2.2 Parameter separators
5.2.3 Comments in the metafile
5.3 Encoding of parameter types
5.3.1 Integer-bound types
5.3.2 Real-bound types
5.3.3 String-bound types
5.3.4 Enumerated types
5.3.5 Derived types
5.3.6 Bitstream datatype
5.3.7 Structured data record operands
5.4 Forming names
5.4.1 Words deleted
5.4.2 Words added
5.4.3 Words used unabbreviated
5.4.4 Abbreviations
5.4.5 The derived element names
6 Encoding the CGM elements
6.0.1 Comments on the element codings
6.0.2 Defaults and parameter range constraints
6.0.3 Allowable productions in clear text metafiles
6.1 Encoding delimiter elements
6.2 Encoding metafile descriptor elements
6.3 Encoding picture descriptor elements
6.4 Encoding control elements
6.5 Encoding graphical primitive elements
6.6 Encoding attribute elements
6.7 Encoding escape elements
6.8 Encoding external elements
6.9 Encoding segment control and segment attribute
       elements
7 Clear text encoding defaults
8 Clear text encoding conformance
9 Encoding rules, proforma, and Model Profile
9.1 General principles
9.1.1 Encodings
9.1.2 Metafile defaults
9.2 Profile proforma tables
A Clear text encoding-dependent formal grammar
B Clear text encoding example

Specifies a clear text encoding of the Computer Graphics Metafile (CGM). This CGM encoding allows metafiles to be created and maintained in a forum which is easy to edit, simple to type and convenient to read. Also specifies the overall format of the metafile and the means by which the comments may be interspersed in the metafile.