[Simple-support] Serialize null objects to <foobar nil="true"/>

[Renato C. R. <cu...@ip...>]

I have been trying to do this for weeks but I could not find a solution!

I tried everything I found on the internet, including @Convert but it 
only works on non null objects!

Please, I seriously need help! How can I make Simple XML serialize null 
objects?

Thanks!

Renato