>Can someone explain to me what are the first three line of ADO's XML output refering to? I have tried to find it from MSDN not to no avail. Thanks.

s refers to the XML-Data namespace containing the elements and attributes that define the schema of the current Recordset.
dt refers to the data type definitions specification.
rs refers to the namespace containing elements and attributes specific to ADO Recordset properties and attributes.

You can find more information in the article XML Integration Features in ADO 2.5
at http://msdn.microsoft.com/xml/articles/xmlintegrationinado.asp.

Robert