As the bottom layer of the ODFDOM hierarchical structure, it provides direct access to the physical storage in the ODF package, such as XML streams, pictures, and embedded objects.
The amount of "vital heat" produced by a specific body was viewed as a direct index of its place in the "great chain of being", a hierarchical order of rank according to degrees of perfection.
The following example shows a SELECT statement with a hierarchical query clause to return all direct subordinates for the manager Meier (employee number 101).