4. Every document is version controlled
That way, as Daniel puts it, "[the document] will not magically alter its contents tomorrow". Or if it does, I can see a history of what was altered. Ideally, this would somehow be built into the protocol/browser rather than be a burden to the publisher.
Also, maybe after a certain amount of time I can no longer modify my document. If I'm the New York Times, this means when I publish a news article document, and it contains an advertisement, that same advertisement forever lives on that document - just like physical newspaper.