XML-Script... or something different?

Xml-Script is part of the Ajax CTP and the new Asp.net Future. It was not included with the final version of Asp.net Ajax v1.0

Then what I thinking about..?

I've seen sampled (during atlas) where you'd define a table structure, or alist structure in XML. then you'd bind it through a webservice, and the webservice would automatically update it. Versus using an update panel and an <asp:datagrid /