shared pointsNotShared notShared
The first value indicates that geometric objects common to two or more other objects, such as polygon boundaries, are first defined and then referenced by their object identifiers. The second value indicates that this is generally true, but that points (or at least some points) may be an exception. The third value implies that, for example, the same bounding arc may be explicitly defined more than once. This is used as a domain in Structuring.