Man pages matching name xml::normalize::libxml in section 3pm:

XML::Normalize::LibXML.3pm.en	debian 10 / libxml-xupdate-libxml-perl
XML::Normalize::LibXML.3pm.en	debian 11 / libxml-xupdate-libxml-perl
XML::Normalize::LibXML.3pm.en	debian 12 / libxml-xupdate-libxml-perl