XML Versus HTML
Soon after XML emerged, there was speculation that XML would replace HTML. Many believed that because they were both descendants of SGML, XML was an upgrade. In reality, HTML and XML are designed for different purposes. HTML presents data, and XML describes the data. Both HTML and XML are important tools in the development of Web-based systems.
XML actually looks a lot like HTML. This is not surprising, because they come from the same source. However, XML provides two primary advantages that HTML does not—validity and well-formed documents.
HTML tags are all predefined. Tags such as <HTML>, <HEAD>, <BODY>, and so on are all defined in the HTML specification. You cannot add your own tags. Because HTML is intended for formatting ...
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