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<ListOfAccountContactInterface>
<Account>
...
</ListOfContact>
</Account>
</ListOfAccountContactInterface>

my $param = SOAP::Data->name("ListOfAccountContactInterface" => \SOAP:
+:Data->value(
SOAP::Data->name("Account" => \SOAP::Data->value(
...
  ))
 ))
));

my $soap_result = SOAP::Lite
-> service('file:/home/wsdl/Contact_Interface.wsdl') 
-> ContactInsertOrUpdate($param);