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# You've learned XML Schema. What's next? * * * ## Overview of XML Schema This tutorial has taught you how to describe the structure of an XML document. You have learned how to use XML Schema to define valid elements in an XML document, just like DTDs. We believe that XML Schema, as a replacement for DTDs, will soon be widely adopted in most web applications. You also learned that XML Schema is comprehensive. Unlike DTDs, XML Schema supports data types (data type) and namespaces (namespace). For more information about XML Schema, please refer to our (#). * * * ## What Should You Learn Next After XML Schema? Next, you should learn WSDL. WSDL is a schema-based language used to describe Web services and how to access them. WSDL can describe Web services along with message formats and protocol details used by these services. If you want to learn more about WSDL, visit our (#).