This class is used to relate two parts of an organization to each other. While this mechanism could conceivably be used to construct an entire organization chart, it is intended to be used by clinical information that needs to understand the relationship between organizational entities involved in clinical care.For example, events occurring at a location may need to be rolled up to a regional level, or an embedded laboratory may share tax ids and national provider ids with the host hospital. Note that this construct is meant to be traversable in either direction. For example, a parent organization could point to its sub-organization(s). Conversely, a sub-organization could point to its parent organization.