This question can be reflected back onto you, after all property rights where designed by liberals. Besides, ownership in this instance is a social contractual element, literally meaning the people (assuming its a democracy) actually decide how ownership works. Otherwise property law would be the exact same in different countries (I think in sweden for example you can't bar people from visiting land you own if its out in the wilderness, unless its a farm)
Yeh, thats why you can define uses. Usage actually has a pretty broad scope, its not an impossible problem.