Man pages matching name xml::xpath::perlsax in section 3pm:

XML::XPath::PerlSAX.3pm.en	debian 10 / libxml-xpath-perl
XML::XPath::PerlSAX.3pm.en	debian 11 / libxml-xpath-perl
XML::XPath::PerlSAX.3pm.en	debian 12 / libxml-xpath-perl