Travis Vandersypen

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The XML Schema Definition Language solves a number of problems posed with Document Type Definitions. Because DTDs prompted much confusion and complaining among XML developers, the W3C set about creating a new standard for defining a document's structure. What the W3C created is something even more complex and flexible than DTDs: the XML Schema Definition Language. In this article we'll look at many aspects of schemas and how you can build and use them. A Little Background Schemas, while more complex than DTDs, give an individual much more power and control over how XML documents are validated. For instance, with the new W3C standard a document definition can specify the data type of an element's contents, the range of values for elements, the minimum as well as maximum number of times an element may occur, annotations to schemas, and much more. In May of 2001 the W3C... (more)