WCF SOAP service method return type for interoperability.

Question

I have created WCF SOAP service.Now to consume in java client what should be the return type of service methods.

Because, suppose WCF service method return type is 'DataSet' .now for java client it doesn't mean what is 'DataSet'. So for that what i have to use?

And which tricks use to send return data from service method to maintain interoperability.