Abstract
This chapter deals with the implementation of the conceptual models that have developed as XML schemata in three ways: in the form of data type Definitions (DTDs), in XML schema, and in Relax NG. This chapter presents an overview of the concepts and facilities of all three schema languages. It deals with the DTD as it is defined in the XML 1.0 specification. It discusses XML namespaces, the XML information model, and XML canonical form. A schema defines a document type by imposing a set of constraints on the document instances. A good understanding of namespaces and the XML information set is essential for appreciating the various features in XML schema definition languages. The W3C recommendation “Canonical XML” defines a canonical form for XML documents, a syntactical form that allows simple character string comparison of two XML documents.
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