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Part: VII Appendixes and Bonus Content o... > Introduction to XML and XSL

Introduction to XML and XSL

HTML, as you know, is short for HyperText Markup Language. The “markup” refers to the library of tags that describes how data should be organized or structured on the page. The browser then parses the information out of those tags and presents it to the user in a friendly and legible fashion. What HTML doesn't do, however, is give any information about what the data means, called metadata. Without metadata, search engines and other data-filtering techniques have to rely on keyword searches or content searches to retrieve information for the user.

XML is about metadata and the fact that different people have different needs for how they categorize and organize that data. Like HTML, XML is a set of tags and declarations. Rather than being concerned with how the data is structured and subsequently parsed by the browser, XML provides information on what the data means and how it relates to other data.


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