is a variable defined in `
Its value is
Specify EPS header.
The value should be a string, a symbol or nil.
String is inserted unchanged.
For symbol bounded to a function, the function is called and should return a
string. For symbol bounded to a value, the value should be a string.
If symbol is unbounded, it is silently ignored.
Empty string or nil mean that no header will be generated.
Note that when the header action comment (;H in EBNF syntax) is specified, the
string in the header action comment is processed and, if it returns a non-empty
string, it's used to generate the header. The header action comment accepts
the following formats:
%% prints a % character.
%H prints the `ebnf-eps-header' value.
%F prints the `ebnf-eps-footer' (which see) value.
Any other format is ignored, that is, if, for example, it's used %s then %s
characters are stripped out from the header. If header action comment is an
empty string, no header is generated until a non-empty header is specified or
`ebnf-eps-header' has a non-empty string value.
You can customize this variable.
This variable was introduced, or its default value was changed, in
version 22 of Emacs.