This file is indexed.

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.

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#!/bin/sh

set -e

if [ "$1" = "configure" ]; then
    update-perl-sax-parsers --add XML::SAX::ExpatXS
    update-perl-sax-parsers --update
fi