There's also another version of XHTML available, version 1.1. This version is in W3C recommendation form. You can find the current version of XHTML 1.1 at www.w3.org/TR/xhtml11.
XHTML 1.1 is a strict version of XHTML, and it's clear that the W3C wants to wean HTML authors from their loose ways into writing very tight XML. How far those HTML authors will follow is yet to be determined.
XHTML 1.1 removes all the elements and attributes deprecated in HTML 4.0, and a few more as well.
<APPLET> Versus <OBJECT>
There's another interesting thing going on in XHTML 1.1: The W3C has long said that it wants to replace <APPLET> and other elements with the Microsoft-supported <OBJECT> element. However, and surprisingly, <OBJECT> is missing ...