sub readthefile {
    my ($file)= (@_);
    print qq(File=$file\n);

    my $xhtml = HTML::TreeBuilder::XPath->new;
    $xhtml->implicit_tags(1);
    $xhtml->parse_file($file)
        or die("Could not parse '$file' : $!\n");

    for my $list ($xhtml->findnodes('/html/body//div/ul/li')) {
        if($list->is_empty) {
            print qq(DELETE\n);
            $list->delete(); # this line does not do what I thought it would :(
        }

    }

    print $xhtml->as_XML_indented;
    $xhtml->delete;
    return (1);
}