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<bitrate name="1000">
                        <track type="V">
...
                                </range>
                        </track>
                </bitrate>

my $twig =  XML::Twig->new(
                        twig_roots => { "bitrate[\@name=\"1000\"]/trac
+k[\@type=\"V\"]/range[1]/rangeStartTime" => \&update,  },
...
    my ($twig, $server) = @_;
        $value= $server->text;
}

"bitrate[\@name=\"1000\"]/track[\@type=\"V\"]/range[position() = 1]/ra
+ngeStartTime"

"unrecognized expression in handler: 'bitrate[@name="1000"]/track[@typ
+e="V"]/range[position() = 1]/rangeStartTime' at try16.pl line 35"

my $count = $t->findnodes("bitrate[\@name=\"1000\"]/track[\@type=\"V\"
+]/range[position() = 1]/rangeStartTime");

error in xpath expression bitrate[@name="1000"]/track[@type="V"]/range
+[position() = 1]/rangeStartTime at position() = 1 at /usr/share/perl5
+/XML/Twig.pm line 3085