XML Schema Definition (XSD)
by Vijay Mukhi, Shruti Gupta, Sonal Mukhi
The XML Schema specifies the properties of a resource, while the XML file stipulates a set of values for these properties. The primary utility of the XML Schema lies in its ability to concede generous amount of autonomy to the programmer to define the rules of data validity; and thereafter, to hand over the responsibility of data validation to the XML validator. This liberates the programmer from the mundane drudgery of the task of data validation.
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by Norman Walsh - O'Reilly Media
This introduction to XML presents the Extensible Markup Language at a reasonably technical level for anyone interested in learning more about structured documents. In addition to XML 1.0 Specification, this text outlines related XML specifications.
by Dan McCreary - Wikibooks
This text provides a detailed description of XML, a computer language for designing web pages, and for defining other, more specialized languages. It covers XML programming, and its uses on the Internet. Exercises are included.
by Ronald Bourret
This paper gives a high-level overview of how to use XML with databases. It describes how the differences between data-centric and document-centric documents affect their usage with databases and how XML is commonly used with relational databases.