This tutorial has taught you how to describe the structure of the XML documents.

You have learned how to use an XML Schemas is 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 the DTDs.

You have also learned that the XML Schema language is very very rich. Unlike DTDs, it support data types and namespaces.

The next step is to learn about the WSDL.

WSDL is a schema-based language for describing Web service and how to access them.

WSDL describes a web service, along with the message format and protocol detail for the web service.

If you want to learn more about the WSDL, please visit our WSDL tutorial.