The <preamble> is text at the beginning of all output files. It is not intended to be visible by default in an Info viewer, but may be displayed upon user request.
<preamble> = <identification> # "This is FILENAME, produced by ..." <copying text> # Expansion of @copying text. <dir entries> # Derived from @dircategory and @direntry.
These pieces are:
An arbitrary string beginning the output file, followed by a blank line.
The expansion of an
@copying environment, if the manual has
one (see @copying).
The result of any
commands present in the manual (see Installing Dir Entries).