Grrrr! Yes this always struck me as something of a bug in SOAP::Lite that the 'helper' modules are in the top-level SOAP:: namespace, whereas, in my opinion, they should be in SOAP::Lite::. Of course it is possibly too late to change this. Conversely, because of the design of SOAP::Lite, I don't think it would be possible to use the existing SOAP components wherever there might be an overlap.
However someone should probably file a bug on SOAP::Lite about this conflict before it is too late to change.
/J\