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Echo is a web application framework that was designed by the company Nextapp. It initially started as a request-response web application framework that leveraged the Swing object model to improve the speed of application development. Through the utilization of the Swing model, Echo was able to make use of concepts such as elements and event-driven programming that removed much of the pain of web application development. Echo2 In late 2005, Nextapp formally declared the release of their new ajax based web application platform, “Echo2”. This framework created on the concepts of Echo (well known aPI, total web abstraction) but delivered the additional advantage of being an ajax environment. Nextapp believed that this approach brought the framework exceptionally close to the capabilities of rich clients. Nextapp also claimed that this reincarnation of the Echo framework given dramatic performance, capability, and user-experience enhancements made possible by its new ajax-based rendering engine. Echo3 During 2007, development on a third generation of the framework, Echo3, started. The attention of this evolution was to go away from generating markup on the server side, and instead to apply rendering peers as native JavaScript objects, with an XML-based state synchronization protocol between client (web browser) and server. This was created in tandem with a core JavaScript framework, providing the capability to describe inheritance hierarchies in JavaScript in a way familiar to developers of object-oriented languages.

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