gd input files may be nested, i.e. they may contain instructions to include other input files.
Inbedding is specified by the tag INBED: followed by the name of the file to be inbedded.
includes the files plot7.gd, plot8.gd and plot9.gd.
A possible application is the multiple use of a complicated combination of graphic elements:
The first line of an included file is assumed to contain the picture title and is ignored.
Multiple inbedding is possible, i.e. inbedded files may contain other inbedded files.
Self-inbedding is of course not allowed.