_:b665079279 . _:b665079279 . _:b665079279 . _:b665079279 "per discussion with Barry Smith" . _:b665079279 . _:b665079279 . _:b665079279 "Spatial region doesn't have a closure axiom because the subclasses don't exhaust all possibilites. An example would be the union of a spatial point and a spatial line that doesn't overlap the point, or two spatial lines that intersect at a single point. In both cases the resultant spatial region is neither 0-dimensional, 1-dimensional, 2-dimensional, or 3-dimensional."@en . _:b665079279 .