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use strict;
use warnings;
use SOAP::Lite 'trace', 'debug';
...

$soap->serializer->register_ns('http://www.cnnmedia.com', 'cnn' );
$soap -> processEpisodicProgramme(SOAP::Data->type( 'xml' => $xmltest 
+));

<soap:Envelope soap:encodingStyle="http://schemas.xmlsoap.org/soap/enc
+oding/" xmlns:soap="http://schemas.xmlsoap
.org/soap/envelope/" xmlns:soapenc="http://schemas.xmlsoap.org/soap/en
+coding/" xmlns:tns="http://www.cnnmedia.com" xmlns:wsdl="http://schem
+as.xmlsoap.
org/wsdl/" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="htt
+p://www.w3.org/2001/XMLSchema-instance">

$soap->serializer->register_ns('http://www.cnnmedia.com', 'cnn' );