<attribute name="picture" type="binary">

</attribute>

sed '|<attribute name="picture" type="binary">|,|</attribute>|{||!d}' Original.file

sed 'type="binary">','</attribute>'{//!d}' Original.file > New.file

#!/usr/bin/perl

use strict;
use warnings;

use XML::Twig;

my $twig = XML::Twig->new(
    'twig_handlers' => {
        'attribute[@type="binary" and @name="picture"]' => sub { $_->delete }
    }
);

$twig ->parsefile ( 'your_file' );
$twig -> print;|

awk '/<attribute name="picture" type="binary">+$/,/</attribute>+$/{next}1' original.txt > new.txt