XML Unleashed

Chapter 2. Modeling Data: Document Type Definitions (DTD) and Schemas

In This Chapter

• XML Data Modeling Basics

• Modeling Data with DTDs

• Modeling Data with XML Schemas

• Comparing the Two Data Modeling Approaches

This chapter introduces you to XML data modeling using DTDs and XML Schemas. Generally speaking, a schema describes the data model of an XML document. There are two fundamental approaches to defining XML schemas: DTDs and XML Schemas. It is important to note throughout the chapter that "schema" is a general term that describes an XML data model, while XML Schema is a specific schema technology that supercedes DTDs.

You'll begin the chapter by learning the basics of XML data modeling, which involves describing the structure of XML documents ...