Which is the correct XHTML for empty elements?

What's the most common XHTML DTD?

What would you put inside of a <![CDATA[ .... ]]> element?

Which is a well formed table?

In which tag do you define the XML namespace?

Correct structure of a definition list?

When referencing an image map, what attribute is assigned to the image?

What is the difference between the @name and @id attributes?

How do XPath statements vary between HTML and XHTML?

Which tag has NOT been deprecated with XHTML?

Which is something you can do in XHTML that you can't do in HTML?