The example at the beginning of this chapter highlights the limitations of HTML. HTML was designed specifically for displaying content in a browser, but isn't good for much else. When the creators of the Web needed a markup language that told browsers how to display web content, they used SGML guidelines to create HTML. SGML, Standard Generalized Markup Language, is acomprehensive set of syntax rules for marking up documents and data which has existed since the 1980s. It is the big kahuna of metalanguages!
As the Web matured, it became clear that there was the need for more versatile markup languages. SGML provided a good model, but it was too vast and complex; it had many features that were unnecessary and wouldn't be used in the Web environment. XML is a simplified and reduced form of SGML, tailored just for the needs of sharing information over the Internet. It is powerful enough to describe data, but light enough to travel across the Web. Much of the credit for XML's creation can be attributed to Jon Bosak of Sun Microsystems, Inc., who started the W3C working group responsible for scaling down SGML to its portable, Web-friendly form.
As of this writing, XML is in Version 1.0, which was first issued in February 1998 and revised in October 2000. Various aspects and modules of XML are still in development.
One of the first things the W3C did once they had XML in place was to apply it to the existing HTML specification. The resulting language is XHTML, which is just HTML rewritten according to the stricter, yet more expandable, rules of XML.
Web Designing Related Interview Questions
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Web Designing Related Practice Tests
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Web Designing Tutorial
Designing For A Variety Of Browsers
Designing For A Variety Of Displays
Web Design Principles For Print Designers
A Beginners Guide To The Server
Printing From The Web
Structural Html Tags
Adding Images And Other Page Elements
Specifying Color In Html
Cascading Style Sheets
Server Side Includes
Designing Graphics With The Web Palette
Audio On The Web
Video On The Web
Flash And Shockwave
Introduction To Smil
Introduction To Dhtml
Introduction To Xml
Wap And Wml
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