The Built Environment hierarchy includes terms for the built and natural environment, covering constructed works and natural landscapes, forming a continuum from the largest natural landscapes and settled areas to the smallest of individual built works. Relation to other hierarchies: The constituent parts of constructed works, such as doors and walls, that extend the continuum at even smaller scale, are found in the Components hierarchy. Concepts may have multiple parents; therefore, in those instances where a concept may logically appear at more than one level of the continuum (e.g., "chapels (rooms or structures)" which may be either single built works or components of a work), it is placed with a preferred parent in the hierarchy containing the smaller scale elements unless factors of common usage, design intent, or historical precedence dictate otherwise; it has a second, non-preferred parent in the other logical hierarchical view (e.g., for "chapels," with Single Built Works).
