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XML Tutorial XML stands for eXtensible Markup Language. XML is designed to transport and store data, not to display data. HTML was designed to display data. XML is important to know, and very easy to learn. Maybe it is a little hard to understand, but XML does not DO anything. XML was created to structure, store, and transport information. XML is just information wrapped in tags. Someone must write a piece of software to send, receive or display it. XML language has no predefined tags. XML allows the author to define his/her own tags and his/her own document structure. 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 concentrate on using HTML for layout and display, 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. Today, a lot of new Internet languages are created with XML: XHTML ( EXtensible HyperText Markup Language ), WSDL ( Web Services Description Language ), WAP ( Wireless Application Protocol ) and WML ( Wireless Markup Language ), RSS ( Really Simple Syndication or RDF Site Summary ), RDF ( Resource Description Framework ) and OWL ( Ontology Web Language ), SMIL ( Synchronized Multimedia Integration Language ).
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