RDFContentSinkImpl::GetDataSource(nsIRDFDataSource*& aDataSource)
RDFContentSinkImpl::GetDataSource(nsIRDFXMLDataSource*& ds)
RDFContentSinkImpl::GetDataSource(nsIRDFDataSource*& aDataSource){    aDataSource = mDataSource;    NS_IF_ADDREF(aDataSource);    return NS_OK;}