SQLXML 3.0 v/s SQLXML 4.0

Hi,

Can you please let me know the difference / enhancement done in SQLXML 4.0 over SQLXML 3.0. I am not able to find the proper documentation/website to understand this. We are using the ExecuteXMLReader method of SQLXMLCommand object and want to see if there is any performance improvement around this area. Thanks in advance.

Cheers,
Praveen Balanagendra