/usr/share/perl5/XML/SAX/ is in libxml-sax-perl 0.99+dfsg-1ubuntu0.2.
This file is owned by root:root, with mode 0o755.
..
/usr/share/perl5/XML/SAX/Debian.pm
/usr/share/perl5/XML/SAX/DocumentLocator.pm
/usr/share/perl5/XML/SAX/Intro.pod
/usr/share/perl5/XML/SAX/ParserDetails.ini
/usr/share/perl5/XML/SAX/ParserFactory.pm
/usr/share/perl5/XML/SAX/PurePerl/
/usr/share/perl5/XML/SAX/PurePerl.pm
/usr/share/perl5/XML/SAX/PurePerl/DTDDecls.pm
/usr/share/perl5/XML/SAX/PurePerl/DebugHandler.pm
/usr/share/perl5/XML/SAX/PurePerl/DocType.pm
/usr/share/perl5/XML/SAX/PurePerl/EncodingDetect.pm
/usr/share/perl5/XML/SAX/PurePerl/Exception.pm
/usr/share/perl5/XML/SAX/PurePerl/NoUnicodeExt.pm
/usr/share/perl5/XML/SAX/PurePerl/Productions.pm
/usr/share/perl5/XML/SAX/PurePerl/Reader/
/usr/share/perl5/XML/SAX/PurePerl/Reader.pm
/usr/share/perl5/XML/SAX/PurePerl/Reader/NoUnicodeExt.pm
/usr/share/perl5/XML/SAX/PurePerl/Reader/Stream.pm
/usr/share/perl5/XML/SAX/PurePerl/Reader/String.pm
/usr/share/perl5/XML/SAX/PurePerl/Reader/URI.pm
/usr/share/perl5/XML/SAX/PurePerl/Reader/UnicodeExt.pm
/usr/share/perl5/XML/SAX/PurePerl/UnicodeExt.pm
/usr/share/perl5/XML/SAX/PurePerl/XMLDecl.pm