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Learn XML and AJAX (Offline) 簡介

XML

Xml (eXtensible Markup Language) is a mark up language.

XML is designed to store and transport data.

Xml was released in late 90’s. it was created to provide an easy to use and store self describing data.

XML became a W3C Recommendation on February 10, 1998.

XML is not a replacement for HTML.

XML is designed to be self-descriptive.

XML is designed to carry data, not to display data.

XML tags are not predefined. You must define your own tags.

XML is platform independent and language independent.

Why xml

Platform Independent and Language Independent: The main benefit of xml is that you can use it to take data from a program like Microsoft SQL, convert it into XML then share that XML with other programs and platforms. You can communicate between two platforms which are generally very difficult.

The main thing which makes XML truly powerful is its international acceptance. Many corporation use XML interfaces for databases, programming, office application mobile phones and more. It is due to its platform independent feature.

If you need to display dynamic data in your HTML document, it will take a lot of work to edit the HTML each time the data changes.

With XML, data can be stored in separate XML files. This way you can focus on using HTML/CSS for display and layout, and be sure that changes in the underlying data will not require any changes to the HTML.

With a few lines of JavaScript code, you can read an external XML file and update the data content of your web page.

In the real world, computer systems and databases contain data in incompatible formats.

XML data is stored in plain text format. This provides a software- and hardware-independent way of storing data.

This makes it much easier to create data that can be shared by different applications.

AJAX

AJAX is an acronym for Asynchronous JavaScript and XML. It is a group of inter-related technologies like JavaScript, DOM, XML, HTML/XHTML, CSS, XMLHttpRequest etc.

AJAX allows you to send and receive data asynchronously without reloading the web page. So it is fast.

AJAX allows you to send only important information to the server not the entire page. So only valuable data from the client side is routed to the server side. It makes your application interactive and faster.

ajax is not a technology but group of inter-related technologies. AJAX technologies includes:

- HTML/XHTML and CSS

- DOM

- XML or JSON

- XMLHttpRequest

- JavaScript