SOAP::Lite for Perl is a collection of Perl modules which provides a simple and lightweight interface to the Simple Object Access Protocol (SOAP, also known as Service Oriented Access Protocol) both on client and server side.
This is a simple answer addressed in an article I wrote for Builder.com entitled A Hands On Tour of SOAP::Lite. The answer is also answered, albeit indirectly, in a previous post about complex types. The secret is properly escaping the SOAP::Data element like so: \SOAP::Data. I know, it is not very intuitive. :-(