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XML and Client/Server

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Hi I have a client and a server. The Client sends a request to a servlet. Ths servlet connects to database and get the data and sends it back to the client as respons. If everytime the client needs data it sends request to the server and after a while get a respons from the server then i can't any more see the advantage of using XML. When we talk about effeciency, performance. I ask this question because i heard that XML has a search mechnism (XQL) that can serach data at client side. Can this mechanism work without caching data at client side, if not, how does it work?
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