Frame-Based Representation

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Frame-Based Representation

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(birds fly, but penguins do not) multiple inheritance. Birds. Bird1. Bird2 ... WITH Residence = Pittsburgh. WITH Age = ?Age. IF Frame ?x. instance-of Humans ... – PowerPoint PPT presentation

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Title: Frame-Based Representation

1
Frame-Based Representation

Frame stereotypical knowledge knowledge of some
concept.

2
Frames

Hold Structure and Behavior of a class of
objects/concepts
Structure
properties/data/attributes
Behavior
methods, rules defining how instances of the
class typically behave
Generic structure and behavior defines at class
level is specified in instances

3
Inheritance

Structural and behavioral properties are
inherited
from super-class to sub-classes
subclasses automatically carry the structure an
behavior of super-class
exception handling
(birds fly, but penguins do not)
multiple inheritance

4
Multiple Inheritance
5
Facets

Facets
provide further information on a
property/attribute
define constraints on property value
(data type, range of values, etc.)
how to obtain a value for a property
(IF-NEEDED method)
what to do if a value changes
(IF-CHANGED method)

6
Properties and Facets Example
Object name Refrigerator
Class Home Appliances
- Initialize - from Database - from Procedure -
Expert Rules - User specified - by Inheritance -
Message passing from other objects
7
Communication between objects
IF-CHANGED methods
Defrost Timer
Refrigerator
Heating Coil
8
Rule Interaction with Objects