You Have Learned DTD, What's Next?

DTD Summary

This tutorial has explained how to describe the structure of an XML document.

You have learned how to use DTD to define the valid elements of an XML document, and how to declare the DTD internally within your XML or as an external reference.

You have learned how to declare valid elements, attributes, entities, and CDATA sections for an XML document.

You have also seen how to validate an XML document against a specific DTD.

You Have Learned DTD, What's Next?

The next step should be to learn XML Schema.

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

XML Schema is an XML-based alternative to DTD.

Unlike DTD, XML Schema supports data types and namespaces.

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