<math xmlns="http://www.w3.org/1998/Math/MathML">
    <mfrac>
         <mi>a</mi>
         <mrow>
            <mi>bcde</mi>
         </mrow>
    </mfrac>
    <msqrt>
        <mi>s</mi>
        <mi>e</mi>
        <mi>f</mi>
    </msqrt>
</math>


#!/usr/bin/perl
use strict;
use warnings 'all';
use XML::LibXML;

my $mediaIdFrom = "MEDIAID_TEST";
my $VodItemIdFrom = "VODITEM_ID_TEST";
my $mediaId="";
my $vodItemId="";

my $filename = 'sample1.xml';
my $out_filename = "sample2.xml";

my $dom = XML::LibXML -> load_xml(location => $filename);

foreach $mediaId ($dom->findnodes('/ScheduleProvider/Episode/Media/@id')) {
    $mediaId->setValue("xx " . $mediaIdFrom . " yy");
}

foreach $vodItemId ($dom->findnodes('/ScheduleProvider/VoidItem/@id')) {
    $vodItemId->setValue($VodItemIdFrom);
}
#### for storing the output separate XML file
$dom->toFile($out_filename);`