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

by mldvx4 (Friar)
on Aug 31, 2022 at 15:11 UTC ( [id://11146565]=perlquestion: print w/replies, xml ) Need Help??

mldvx4 has asked for the wisdom of the Perl Monks concerning the following question:

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.

Replies are listed 'Best First'.
Re: Adding Dublin Core to RSS 2.0 via XML::RSS?
by Anonymous Monk on Sep 01, 2022 at 06:48 UTC
    Dublin core? Which version are you running XML::RSS

      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

        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.

      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.

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