Ok,
Found the module code and I believe I understand what it going on now.

    my $string = "M 6,0 C 2.676,0 0,2.676 0,6 L 0,$cont_tbh L $cont_w,
+$cont_tbh L $cont_w,6 C $cont_w,2.676 $cont_w - 2.676,0 $cont_w - 6,0
+ L 6,0 Z";
    my $tag = $svg->path(
        d => $string,
        id    => 'pline_1',
        style => {
            'fill-color' => 'green'
        }
    );
[download]

The following allows me to send a custom string to the SVG engine.
Thanks, Paul.