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XStream - Serialize objects to XML/JSON and back again
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"XStream is a simple library to serialize objects to XML and back again:
 - Ease of use
 - No mappings required
 - Performance
 - Clean XML
 - Requires no modifications to objects
 - Full object graph support
 - Integrates with other XML APIs
 - Customizable conversion strategies
 - Error messages
 - Alternative output format"

For more information:
http://xstream.codehaus.org/