Man pages matching name xml::sax::expatxs::encoding in section 3pm:

XML::SAX::ExpatXS::Encoding.3pm.en	debian 10 / libxml-sax-expatxs-perl
XML::SAX::ExpatXS::Encoding.3pm.en	debian 11 / libxml-sax-expatxs-perl
XML::SAX::ExpatXS::Encoding.3pm.en	debian 12 / libxml-sax-expatxs-perl