HTML is marvelously simple but not very powerful. In 1996, Jon Bosak of Sun Microsystems to spearheaded the development of the XML standard to lend power, efficiency, cross-platform standards, and simplicity to the networking of databases on the Internet. At the time of this writing, the world is converging upon an important standard known as RDF (Resource Description Framework) rooted in XML that will be the biggest thing to hit the Internet since HTML hit the Internet in 1991.
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