- XML DTDs for HTML 4.0
- (Did you know that HTML 4.0 was defined with three SGML DTDs? Most people
and applications used the tags from HTML 4.0 but ignored the DTDs. Most current
HTML isn't SGML, but it could have been)
- The ability to create HTML that is also Valid XML (using a public
- The advantages of Case 2, plus expectation that others will know how to
process your HTML.
XHTML specification available