You can return any object of any complex data structure, as long as
you can write an xml schema for that.
However, rather than returning the Set object, you could return an
array, which could further be cast down to a set by the client application.
The purpose of web services is to have a standard interface that both
parties agree with (the provider of the service and the client). You should
keep your interface simple so that you can write a simple schema for that. That
will be easier for you to manage and simple for your client to understand.
If you want to re-use the component in your application that you
want to expose as web service, you can write an adapter class to your business
method. And expose that adapter's interface to client. So in future if you
change the original method's signature your clients will still get benefit.
Hope that helps.
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