Table of Contents

• DTD Tutorial
• DTD Introduction
• DTD Building Modules
• DTD Elements
• DTD Attributes
• Comparing XML Elements and Attributes
• DTD Entities
• DTD Validation
• DTD Examples
• DTD Summary

Summary

This tutorial has taught you how to describe the structure of an XML document using DTD.

You learned how to define legal elements in an XML document using DTD, and how to declare DTD internally or externally within your XML.

You also learned how to declare legal elements, attributes, entities, and CDATA sections in an XML document.

You saw how to validate an XML document based on a specific DTD.

Next Steps

The next step should be learning about XML Schema.

XML Schema is used to define the legal elements of an XML document, similar to DTD. We believe that XML Schema will soon replace DTD and be widely used in most web applications.

XML Schema is a DTD replacement based on XML.

Unlike DTD, XML Schema supports data types and namespaces.

If you want to learn more about XML Schema, please visit our XML Schema Tutorial.