Some hierarchy can be constituted-of-or-filled-with extensibility.
A hierarchy can be constituted-of-or-filled-with parameters.
A hierarchy can be constituted-of-or-filled-with measurements.
A hierarchy can be constituted-of-or-filled-with renderings.
A descendant of a (script node) can be part of a (transformation hierarchy).
A (transformation hierarchy) may describe parts of the virtual world.