CS 898N – Advanced World Wide Web Technologies Lecture 20: XML Chin-Chih Chang

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CS 898N – Advanced World Wide Web Technologies Lecture 20: XML Chin-Chih Chang

XML These are some XML reference books: –XML in a Nutshell : A Desktop Quick Reference (Nutshell Handbook) by Elliotte Rusty Harold, W. Scott Means, Paperback pages (January 15, 2001), O'Reilly & Associates; ISBN: , $20.96 –Learning XML by Erik T. Ray, Paperback pages 1st edition (February 2001), O'Reilly & Associates; ISBN: , $24.46

Why do we need XML? XML is used to aid the exchange of data. It makes it possible to define data in a clear way. Both the sending and the receiving party will use XML to understand the kind of data that's been sent. By using XML everybody knows that the same interpretation of the data is used.

Why do we need XML? EDI (Electronic Data Interchange) has been for several years the way to exchange data between businesses. EDI is expensive, it uses a dedicated communication infrastructure. And the definitions used are far from flexible. XML is a good replacement for EDI. It uses the Internet for the data exchange. And it's very flexible.

Why do we need XML? XML makes communication easy. It's a great tool for transactions between businesses. But it has much more possibilities. You can define other languages with XML. A good example is WML (Wireless Markup Language), the language used in WAP- communications. WML is just an XML dialect.What is XML

What is XML XML is a meta-language. A meta-language is a language that's used to define other languages. You can use XML for instance to define a language like WML. XML is a smaller version of SGML. It's easy to master and that's a major advantage compared to SGML which is a very complex meta-language.

What is XML With XML you can : –Define data structures –Make these structures platform independent –Process XML defined data automatically –Define data structures With XML you cannot –Define how your data is shown. To show data, you need other techniques.