Using XML is one of the best ways for structuring external content in a logical format that is easy to understand, process, and update.

The XML libraries have been completely overhauled in ActionScript 3. It implements the powerful XML-handling standards defined in ECMAScript for XML (E4X) specification. The XML class contains methods and properties for working with XML objects.

In AS 2 we create an XML object and then call the XML.load() method in order to load in an external file. In AS 3 loading of external XML files is handled by the new URLLoader class.

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In classical web applications, when we submit a form, although most of the page remains the same, whole page is reloaded from the server. This causes long waiting times and waste of bandwidth. The combination of a group of web technologies known as AJAX is come up with to create interactive web  applications. With AJAX, web applications can retrieve data asynchronously from server while not refreshing the whole page.

AJAX is a shorthand for asynchronous JavaScript and XML. AJAX is not a technology in itself, but a term that refers to the use of a group of technologies together.

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