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There is one point of terminology in the documentation which I
now realize is confusing.  The config file parser class specifies the
syntax of how directives and values are written in the config file:

    Verbose yes
    Verbose=yes
    {Verbose => 'yes'}

The programmer can create a "parsing function or method", which
converts a string representation into a Perl value (or object).  This
code can than be used transparently with any of the file parsing
classes.

    sub yes_no {
        my ($val) = @_;
        if ($val =~ m/^y/i) {
            return 1;
        } else {
            return 0;
        }
    }