How to achieve data exchange iphone client software and server-side?

How to achieve data exchange iphone client software and server-side?
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I heard that using json but do not know how to solve tutorial request seeking information
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Solving! ! ! ! ! ! ! !
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The server can return a variety of formats, using Webservice return soap, returns json format is also available.
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In the iphone has json format parsing library. Json string sequences can be turned into the iphone NSMutableArray, NSDictionary object
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After the components can be used to achieve http://github.com/stig/json-framework/ SBJSON There Demo Download
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SBJSON


xml interaction is good