Applets, Flash, etc. in DocBook

How should one embed a Java applet, Flash program, etc. in a DocBook 5 
document with the goal of eventual conversion to HTML?

-- 
Elliotte Rusty Harold  
XML in a Nutshell 3rd Edition Just Published!
http://www.cafeconleche.org/books/xian3/
http://www.amazon.com/exec/obidos/ISBN=0596007647/cafeaulaitA/ref=nosim