XML XSD Tutorial
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Understanding XML Schema

XML 1.0 is a good example of a language that lacked a sensible type system. Without a type system, the information found in an XML 1.0 document can only be treated as text. This requires developers to know about the "real type" ahead of time so they can perform the necessary coercions in their code.

The XML Schema definition language (XSD) provides a type system for XML processing environments. In a nutshell, XML Schema makes it possible to describe types that you intend to use. An XML document that conforms to an XML Schema type is often referred to as an instance document, very much like the traditional object-oriented (OO) relationship between classes and objects (see Figure 2). This is a conceptual shift away from the way Document Type Definitions (DTD) fundamentally worked, one that offers more flexibility when mapping to traditional programming language or database type systems. In these environments, XML Schema largely deprecates the use of DTDs.

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XSD Tutorial: XML Schemas For Beginners

XSD Tutorial: XML Schemas For Beginners | XML XSD Tutorial | Scoop.it
This five-part article gives a basic overview of the building blocks underlying XML Schemas, showing how and when to use them.
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