This file is indexed.

preinst is in w3c-dtd-xhtml 1.2-4.

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
# Automatically added by dh_installcatalogs
if test -f /etc/sgml/w3c-dtd-xhtml.cat -a "(" "$1" = "upgrade" -o "$1" = "install" -a -n "$2" ")" && 
		! dpkg-query -S /etc/sgml/w3c-dtd-xhtml.cat >/dev/null 2>&1; then
	# If the dpkg-query command returns non-zero, the central catalog is
	# not owned by any package. This is due to an old behaviour of
	# debhelper. Now that file becomes a conffile. In order to avoid a
	# question during installation, we remove the old non-conffile.
	mv /etc/sgml/w3c-dtd-xhtml.cat /etc/sgml/w3c-dtd-xhtml.cat.old
fi
# End automatically added section