post_install()
{
	install-catalog --add /etc/sgml/catalog /usr/share/sgml/docbook/sgml-dtd-3.1/catalog
}

pre_remove()
{
	install-catalog --remove /etc/sgml/catalog /usr/share/sgml/docbook/sgml-dtd-3.1/catalog
}

op=$1
shift
$op $*