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<h1>You Have Learned DTD, Now What?</h1>
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<h2>DTD Summary</h2>
<p>This tutorial has taught you how to describe the structure of an XML document.</p>
<p>You have learned how to use a DTD to define the legal elements of an XML
document, and how a DTD can be declared inside your XML document, or as an
external reference.</p>
<p>You have learned how to declare the legal elements, attributes, entities, and
CDATA sections for XML documents.</p>
<p>You have also seen how to validate an XML document against a DTD.</p>
<hr />
<h2>Now You Know DTD, What's Next?</h2>
<p>The next step is to learn about XML Schema.</p>
<p>XML Schema is used to define the legal elements of an XML document, just like
a DTD. We think that very soon XML Schemas will be used in most Web applications
as a replacement for DTDs.</p>
<p>XML Schema is an XML-based alternative to DTD.</p>
<p>Unlike DTD, XML Schemas has support for data types and namespaces.</p>
<p>If you want to learn more about XML Schema, please
visit our <a href="../schema/default.asp">XML Schema tutorial</a>.</p>
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