Help with positioning DSRequest custom node

[dindeman]

In the context of a RestDataSource I managed to generate a request like this by overriding RestDataSource.transformRequest:

<request>
  <data>
     <isc_OID_21>
       [B]<customTag>blah</customTag>[/B]
       <field1>foo</field1>
       <field2>bar</field2>
     </isc_OID_21>
   </data>
   <oldValues></oldValues>
   <dataSource>isc_OID_21</dataSource>
   <operationType>add</operationType>
   <componentId>isc_OID_53</componentId>
</request>

where my custom node <customTag> goes inside the <data> tag.

But can anyone tell me how to generate a request like the one below??

<request>
  [B]<customTag>blah</customTag>[/B]
  <data>
     <isc_OID_21>       
       <field1>foo</field1>
       <field2>bar</field2>
     </isc_OID_21>
   </data>
   <oldValues></oldValues>
   <dataSource>isc_OID_21</dataSource>
   <operationType>add</operationType>
   <componentId>isc_OID_53</componentId>
</request>

where my custom node <customTag> goes under the <request> tag at the same level as the <data> tag.
I have tried with DSRequest.setAttribute(String, String) but that didn't have any impact on the request XML.

Thanks,
Luc

[dindeman]

Ok I found a solution and I produced a DSRequest XML as follows:

<request>
  [B]<fooTag>barValue</fooTag>[/B]
  <data>
     <isc_OID_21>       
       ...
     </isc_OID_21>
   </data>
   <oldValues></oldValues>
   <dataSource>isc_OID_21</dataSource>
   <operationType>add</operationType>
   <componentId>isc_OID_53</componentId>
   ...
</request>

Here is how I did it:

import com.google.gwt.xml.client.Document;
import com.google.gwt.xml.client.Element;
import com.google.gwt.xml.client.XMLParser;

// ...

RestDataSource dataSource = new RestDataSource() {
	@Override
	protected Object transformRequest(DSRequest dsRequest) {
		// We assume that Object is the request XML String since we have used DSDataFormat.XML 
		String xml = (String) super.transformRequest(dsRequest);
		
		Document doc = XMLParser.parse(xml);
		Element root = doc.getDocumentElement();
		Element newElement = doc.createElement("fooTag");
		newElement.appendChild(doc.createTextNode("barValue"));
		root.appendChild(newElement);
			
		xml = doc.toString();
		
		return xml;
	}
};
dataSource.setDataFormat(DSDataFormat.XML);

So I used the embedded GWT XML parsing interface.

To Isomorphic team: is there any better approach using some SmartGWT interface?