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';

[download]

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

In reply to Re^2: Adding Dublin Core to RSS 2.0 via XML::RSS? by mldvx4
in thread Adding Dublin Core to RSS 2.0 via XML::RSS? by mldvx4

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