Use the delete command to delete an entity or an instance of
    an entity.  As with create, most entities support the delete
    command; however, some entities are deleted automatically by
    software, and so do not support the delete command. For example,
    entities that correspond to communications links are usually
    deleted dynamically as these links are closed. You cannot delete
    an entity if it has child entities; you must delete all child
    entities before you can delete the parent entity. It is usually,
    though not always, the case that you must disable an entity
    before you can delete it.