Page 129 - DCAP506_ARTIFICIAL_INTELLIGENCE

Unit 9: Weak Slot and Filler Structures

Notes



The following points are to be noticed.:

 Instances of SLOT are slots
 Related with SLOT are attributes that every instance will inherit.
 Every slot has a domain and range.

 Range is divided into two parts one the class of the elements and the other is a restraint
which is a logical expression if absent it is taken to be true.
 The to-compute attribute includes a procedure to calculate its value. E.g. in Position where
we make use of the dot notation to allocate values to the slot of a frame.
 Transfers through lists other slots from which values can be derived from inheritance.

!

Caution If there is a value for default then it must be passed on unless an instance has its
own value

9.2.2 Interpreting Frames

A frame system interpreter must be competent of the following so as to exploit the frame slot
demonstration:
 Steadiness checking — when a slot value is added to the frame depending on the domain
attribute and that the value is legal using range and range constraints.

 Broadcast of definition values along isa and instance links.
 Inheritance of default values along isa and instance links.
 Calculation of value of slot as required.
 Verifying that only correct number of values calculated.

Self Assessment

Fill in the blanks:

7. Frames can also be considered as an expansion to ............................. .
8. A ............................. is a compilation of attributes or slots and related values that portray
some actual world entity.

9. Frames on their own are not mainly useful but frame systems are a powerful manner of
encoding ............................. to sustain reasoning.
10. The more ............................. the system it turns out to be more useful to use frames.

11. A ............................. is a set and its elements contain properties.

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