Man pages matching name xml::atom::simplefeed in section 3pm:

XML::Atom::SimpleFeed.3pm.en	debian 10 / libxml-atom-simplefeed-perl
XML::Atom::SimpleFeed.3pm.en	debian 11 / libxml-atom-simplefeed-perl
XML::Atom::SimpleFeed.3pm.en	debian 12 / libxml-atom-simplefeed-perl