Adding Dublin Core to RSS 2.0 via XML::RSS?

[mldvx4]

If I read correctly in the manual page it is possible to add Dublin Core (DC) metadata to RSS 2.0 feeds, even via the XML::RSS module. I seem to be missing something.

#!/usr/bin/perl

use XML::RSS;

use strict;
use warnings;

my $rss = XML::RSS->new (version => '2.0');
$rss->channel(title          => 'Example Corp, Inc',
              link           => 'http://example.com',
              language       => 'en',
              description    => 'a one-stop-shop for all your Linux',
    );

$rss->add_item(title => "GTKeyboard 0.85",
               permaLink  => "http://example.com/1999/06/21/93.html",
               description => 'blah blah',
               dc => {
                   creator => 'an author',
                   contributor => 'an editor',
               },
    );

print $rss->as_string;

exit(0);

If I run that, I get the following, without the Dublin Core. I was expecting the Dublin Core metadata elements to somehow show up.

<?xml version="1.0" encoding="UTF-8"?>

<rss version="2.0"
 xmlns:blogChannel="http://backend.userland.com/blogChannelModule"
>

<channel>
<title>Example Corp, Inc</title>
<link>http://example.com</link>
<description>the one-stop-shop for all your Linux</description>
<language>en</language>

<item>
<title>GTKeyboard 0.85</title>
<description>blah blah</description>
<guid isPermaLink="true">http://freshmeat.net/news/1999/06/21/93.html<
+/guid>
</item>
</channel>

I see that xmlns:dc="http://purl.org/dc/elements/1.1/" is missing from the RSS element.

Perhaps I have to add the namespace

If so, how do I add it for RSS 2.0, not 1.0? The module seems to accept both legitimate DC elements as well as random stuff when making objects but does not print them.

----

Edit:

I've also tried,

my $rss = XML::RSS->new (version => '2.0',
                         'xmlns:dc'=>"http://purl.org/dc/elements/1.1/
+",
    );

and

my $rss = XML::RSS->new (version => '2.0',
                         namespaces => { 'xmlns:dc'=>"http://purl.org/
+dc/elements/1.1/" },
    );

Neither produce any visible changes, even using Data::Dumper.

[Anonymous Monk]

Dublin core? Which version are you running XML::RSS

[mldvx4]

Wait. I'm not sure any more since the source says one thing and the running module seems to say something else:

$ perl -MXML::RSS -e 'print $XML::RSS::VERSION,"\n";'
1.59

$ grep -E '1.59|1.62'  /usr/local/share/perl/5.34.0/XML/RSS.pm
$XML::RSS::VERSION = '1.62';
$VERSION = '1.59';
version 1.62

I've deleted the existing module, reinstalled it (again) via CPAN, and double checked that there is only one instance:

$ find /usr -type f -name 'RSS.pm' -print 2>/dev/null
/usr/share/perl5/XML/Feed/Entry/Format/RSS.pm
/usr/share/perl5/XML/Feed/Format/RSS.pm
/usr/local/share/perl/5.34.0/XML/RSS.pm

$ perl -e 'print join("\n",sort @INC),"\n";' 
/etc/perl
/usr/lib/x86_64-linux-gnu/perl-base
/usr/lib/x86_64-linux-gnu/perl/5.34
/usr/lib/x86_64-linux-gnu/perl5/5.34
/usr/local/lib/site_perl
/usr/local/lib/x86_64-linux-gnu/perl/5.34.0
/usr/local/share/perl/5.34.0
/usr/share/perl/5.34
/usr/share/perl5

[hv]

Looking at the code, I'm fairly confident that you have v1.62, and that the claim of v1.59 is a release-process bug. I've reported this as a perl-XML-RSS issue.

[mldvx4]

It appears to be XML::RSS version 1.62:

$ head -n2 /usr/share/perl5/XML/RSS.pm
package XML::RSS;
$XML::RSS::VERSION = '1.62';

That supports RSS 2.0 and that, if I read the spec correctly, allows additional namespaces, such as Dublin Core.