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To sum up, the extensions to Davis' architecture which are needed are
as follows:
- A further elaborated semantic relation hierarchy, including
subsorts for orient-rel, extend-rel and
conf-rel.
- An explicit ontological distinction between states and events.
- Mechanisms for addressing polysemous verbs.
- Mechanisms for incorporating the semantic contribution of
modifiers.
- The introduction of a situation index.
- A further developed representation for nominals
(things).
- A description of the semantics of prepositions.
- Incorporation of defaults.
These will be incorporated as described in the following two sections.