That's right. It's called Unam Sanctum. And the benefits of that claim are doled out to different kingdoms. If you think about the earth as a Cartesian coordinate system, then you will see that surveys can be made upon the same earth but at different Z coordinates. That way the planes do not intersect in trespass. When it becomes necessary to interact with another dominion an agreement must be made.
Dominion is birthed out of Claim.