Yes, one would think so based on the manual page, but in practice it does not print any of Dublin Core metadata which has been added. The following adds it to the object just fine:

    $rss->add_item(
        title       => $title,
        link        => $link,
        description => $description,
        pubDate     => $modified_date,
        dc          => { subject=>'foo', date => $modified_date },
    );
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And that addition can be seen using Data::Dumper. However, print $rss->as_string; is failing to show the full RSS entry. It shows only certain fields. So my script is still missing something, but what?