GKS provides metafiles for the storage of graphical information. Their principal uses are:
There is no official ISO standard for writing a GKS metafile. However, in Appendix E of the ISO GKS Functional Description document a metafile format is described, and its use is recommended. A GKS metafile created using this format is known as an Appendix E metafile. Unfortunately, not all implementations follow the Appendix E format, and so metafiles created by different GKS packages may be incompatible. In fact, even different examples of Appendix E metafiles may be incompatible due to variations in the file record lengths, etc.