Knowledge Representation. Structured Objects. Structural knowledge is important e.g. viral meningitis is meningitis Representation is analogous to graphs or records. Motivation: Grouping of knowledge intuitively All knowledge about an entity is stored together
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A B A B Cats Mammals
A B A B Bill Cats
A B R(A,B) Bill 12
A B x x A R(x,B) Birds 2
A B x y x A Birds Birds
y B R(x,y)
<owner (a person)>
<mother (an elephant with <sex female>) >
< e1 <member-of american-person
<name “Mickey Mouse”>
<personality unpleasant> >
< e3 <member-of dog>
<owned-by e1> >
< dog-owner <superclass person>
<owns (a dog) >
<must-have (a dog-licence) >
<personality pleasant> >
<dog <superclass pet
< address (Get address of owned-by) >
Pacifist : false
Pacifist : true
Pacifist : ?
Birds are usually, covered with feathers, fly and reproduce by laying eggs. There are three groups of birds, flightless birds, songbirds and scavengers. Flightless birds do not fly. Song birds eat bugs and seeds while scavengers eat meat. Sparrows and canaries are both flightless birds, the difference between them being that canaries are found in tropical countries, while sparrows are found in North America. Penguins are flightless birds; they eat fish and are found in the South Pole. Opus, Tweety and Beaky are all birds; Opus is a penguin, Tweety is a canary and Beaky is a rather unusual bird as he is a mix between a penguin and a canary.
Represent the information above using frames. What would be the results of the following queries?