What's next after learning DTD?

DTD Summary

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

You have learned how to define the legal elements of an XML document using DTD and how to declare DTD internally or as an external reference in your XML.

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

You have also seen how to validate an XML document based on a DTD.

What should you learn next after learning DTD?

The next step should be to learn 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 used in most web applications.

XML Schema is an alternative to DTD based on XML.

Unlike DTD, XML Schema supports data types and namespaces.

If you want to learn more about XML Schema, please visit ourXML Schema Tutorial》。