21.7. Summary

This chapter covered the basics of XML, a fairly robust and extensible markup language that can be used to represent a wide range of data. You learned how similar XML and HTML were in structure, but also how different XML can be to suit its purposes. You learned how an XML document is defined, its elements declared, and how the language could be extended.

The rest of this part of the book covers XHTML Basic as well as how to clean up and validate your documents, and presents a handful of HTML tips and tricks. The next part of the book covers CSS, the other half of the Web document equation.