They can further be classified into primitive and condensed objects. They can be realized expanded or condensed. Expanding means realizing the representations of the contained objects, condensing means realizing the representation of the object itself instead of its contained objects. Composite objects - objects containing other objects, but not having a representation of their own. Composite objects can be classified into compound objects and relations.
Secondary objects provide additional, more detailed information.
This makes a powerful tool to convey relationships. Scenes and Paths - scene and path objects hold the event information, that is, they contain the story script. They can be used as language objects as well, in order to allow making references within the language. Compound objects are used to create the object hierarchy . This approach lends itself to imposing a conceptual object structure.