Java EE (Java Enterprise Edition) General Discussion

In my application I have to write various web services but majority of the web service has to
query database and return back bulk data(rows>10K) through web service.

So I would like to ask what is the efficient way of transferring bulk data using web service as presently
Iam returning the dataset as xml String (using StringBuilder) from web service and consuming the same at client end.
Is there a better way to this in web service?

My env:
Front end can be in any other technology ,UI like C#
Back end : Tomcat 6 on Java 6 with Axis2

Thanks in advance