[platform-ui-dev] Any official document which states that platform-ui co

[Jan Diederich <j-h.diederich@xxxxxxxxxxxxxxxxxxx>]

Hello,
is there any official document which states that platform UI code 
contributions must be in pure Java?
It's just a general question, I wished I had a book source, or webpage, 
where I can point people to, like:
"Any platform UI contributions must be in _pure_ Java, not in some Java 
extending languages like AspectJ. Look at: 
www.eclipse.org/platformUI/HowToContribute/PureJavaRule.html. It's 
written there.".

But I can't find it.
Any link or book, anyone?

Please.