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A frame system interpreter must be capable of the following in order to exploit
the frame slot representation:
- Consistency checking - when a slot value is added to the frame relying
on the domain attribute and that the value is legal using range and range
constraints.
- Propagation of definition values along isa and instance
links.
- Inheritance of default.
values along isa and instance links.
- Computation of value of slot as
needed.
- Checking that only correct number of values computed.
See Exercises for further instances of drawing inferences etc. from
frames.