Everything you need to know about SAJAX!!!!
Some have preferred to use JSON instead of XML but an efficient mark-up language is all that Ajax needs to perform well. The efficiency it brings is almost second to none and the interface an Ajax application could do is beyond par.
Technically, it could be integrated in any Ajax based website but the website or the application will not look good. An ideal Ajax based application could refresh parts of the webpage – and only those that have been changed will be activated. Other languages could be integrated but they will just look bad in the website.
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