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Part V: Advanced XHTML Concepts and Appl... > Document Type Definitions in Detail

Chapter 22. Document Type Definitions in Detail

by Kynn Bartlett

In this chapter

Understanding DTDs

Reading the XHTML DTDs

Designing for the Real World: Defining Your Own DTD

In previous chapters, you've used the <!DOCTYPE> tag at the beginning of your Web pages to specify which type of XHTML—Strict, Transitional, or Frameset—you want to use. The <!DOCTYPE> tag can almost seem like a magical incantation—a special secret code that looks like gibberish but somehow works after a fashion. This chapter explains exactly what is happening when you use <!DOCTYPE>, teaches you the basics of XML Document Type Definition (DTD) syntax, shows you how to read the XHTML DTDs, and even demonstrates how you can modify the XHTML DTDs to extend the language.


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