I think it's good to have principles, rules, whatever you call them. But I also think that out of this list...
Rule 1: Be Honest with one another
Rule 2: Don't keep secondary relationships a secret
Rule 3: Talk about your feelings, especially any jealousy
Rule 4: Maintain an open dialogue and strong communication
Rule 5: Respect each other's feelings and work together towards resolving issues
...rules 2-4 are just rule 1 narrowed down to a more specific context. And it seems to me rule 5 follows from rule 1 as well, although less directly. So I don't see a point in making a whole list that's just one basic principle repeated over and over again.
It's great if it helps you, of course. It's just not something I think is really necessary.