At least one rule.
Rules that have at least a rule keyword, a rule value, and a corresponding profile. Rules must also have a minus sign (-) in the begin and finish fields if there is no entry.
The rules file allows:
A comment after the pound sign (#) anywhere on a line. If a line begins with a #, the entire line is a comment line. If a # is specified in the middle of a line, everything after the # is considered a comment.
Blank lines.