Today WEB applications business logic tier responsible to transform Structure data into hierarchical data. Business Logic deals with objects graphs, Structure data from databases and hierarchical data (XML/HTML). Those three worlds aren’t very well integrated. X# aim is to overcome this shortcoming.
If you find X# interesting refer to the following link : http://www.research.microsoft.com/~emeijer/Papers/XS.pdf
but dead ... http://weblogs.asp.net/dbrowning/archive/2003/12/16/43866.aspx
Thank you guys ...