defineDataSourceDataSet( queryDefn );  populateQueryDefn( queryDefn, paramBindingIt, filterIt, bindingIt );  return dataEngine.prepare( queryDefn ).execute( null );
return executeQuery( queryDefn, null, null, null );
	IQueryResults executeQuery( QueryDefinition queryDefn,			Iterator paramBindingIt, Iterator filterIt, Iterator bindingIt )			throws BirtException	{		defineDataSourceDataSet( queryDefn );		populateQueryDefn( queryDefn, paramBindingIt, filterIt, bindingIt );		return dataEngine.prepare( queryDefn ).execute( null );	}