x1 is a universe/cosmos [complete and ordered entirety] of domain/sphere x2 defined by rules x3.
Also world; a universe is a kind of system, one which comprehensively encompasses its domain; e.g. 'universe of discourse', or 'world of birds'; x3 are the rules/defining principles which distinguish the universe from other universes, or from non-universe. See also ciste, plini, kensa, mulno.