# Strip namespace from child tags. Set default namespace, let
    # child tags inherit from it.  So ghetto that we even have to do this
    # and LibXML can't on its own.
    my $normalize_ns = sub {
        my $str = shift;
        $str =~ s/(<\w+)\s+xmlns="\Q$ns\E"/$1/og;
        $str =~ s/<feed\b/<feed xmlns="$ns"/;
        $str =~ s/<entry>/<entry xmlns="$ns">/ if $opts->{'single_entry'};
        return $str;
    };