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The file format for the configuration items (see Configuration) is composed of comments, structured expressions, and whitespace.
A comment begins with ‘;’ (semicolon) and goes to the end of the line. If you use Emacs, you can add the comment:
;; -*- scheme -*-
on the first line to make comments appear differently, presuming syntax highlighting support is enabled.
A structured expression, for the purposes of GNU Alive, is one of:
A decimal number (usually). For instance, 42.
GNU Alive will also accept
#b101010 (binary), #o52 (octal) and #x2A
(hexadecimal) without complaint.
A contiguous sequence of non-whitespace characters that do not include
‘()’ (parentheses), ‘,’ (comma), ‘'’ (apopostrophe, also
known as single-quote), or ‘"’ (double-quote). For instance,
www.gnu.org.
That’s it!
Everything else, that is, all the stuff between comments and structured expressions, is whitespace.