Most XML display groups contain controls that represent database information. TDataGrid and TFieldGroup represent the fields from a dataset. By default, TQueryFieldGroup represents the parameter values for a query or stored procedure or field values that filter a table. XMLBroker indicates the XML broker component that fetches XML data packets for the dataset whose values the controls display. 

If the controls arranged by TXMLDisplayGroup represent the data from a dataset nested within the XML broker's data packet, use the XMLDataSetField to indicate which dataset field to use from the data packet associated with XMLBroker. 

VisibleFields 

XMLDataSetField