I suggest that you define your own array of structures (not maps) rather than using a querybean. Doing a search on querybean, I find a number of different implementations -- and not all of them are the same. And I'm pretty sure that a VB application would have trouble consuming one unless you map it to the XML container Microsoft supplies to contain a .NET DataSet. But then most Java platforms would have trouble consuming it.
In general, you should try to avoid exposing any language-specific object collection through a Web service interface.
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