postinst is in libxml-sax-expatxs-perl 1.32-1ubuntu2.
This file is a maintainer script. It is executed when installing (*inst) or removing (*rm) the package.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 | #!/bin/sh
set -e
if [ "$1" = "configure" ]; then
update-perl-sax-parsers --add XML::SAX::ExpatXS
update-perl-sax-parsers --update
fi
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