In the future most data will not be stored in XML on the server, but will be transformed to XML for the middle tier applications. XML will move data around. XML will be cached. The middle tier will talk to client and server. While tools to manage data have appeared, we all know that data isn't presentation.
Promise is enormous, but reality is that it is too complex.
According to Bosworth, to solve these problems, we should remember the model of the store. We will need a standard way to describe goods, to request goods, to act as the shopping cart and to enable us to buy goods. We should be able to ask for logical subsets of data not all course grained data. We would need a query grammar. New XML grammars will emerge.