How to represent object with atributes (single value and collection value)?

[Alex]

Hi!

Should I write:

  OwnerPartLink Good Price

Or is some syntactic sugar available especially for those kinds of link?

[Alex]

http://wiki.opencog.org/w/Category:Atom_Types does not have AttributeLink or AttributeNode. So - if we want to encode "Apple's price is 1$", we should introduce Price Atom:

a = ConceptNode Apple

p = ConceptNode Price

$1 = NumberNode PriceValue 1$

l1 = MemberLink $1 p

l2 = MemberLink p a

[Ben Goertzel]

A more typical idiom would be

EvaluationLink
PredicateNode "Price"
ListLink
ConceptNode "18 oz. jar Skippy peanut butter"
QuantityNode "$7"

or e.g.

ContextLink
AndLink
ConceptNode "Addis Ababa"
TimeNode "2017"
EvaluationLink
PredicateNode "Price"
ListLink
ConceptNode "18 oz. jar Skippy peanut butter"
QuantityNode "$7"


If we want to say that every peanut butter jar has a price, we could say

ForAllLink $X
ImplicationLink
InheritanceLink
$X
ConceptNode "peanut butter jar"
ThereExistsLink $P
EvaluationLink
PredicateNode "Price"
ListLink
ConceptNode $X
QuantityNode $P

and we could also make an abstraction using DefineLink that would let us say

EvaluationLink
DefinedPredicateNode "hasQuantitativeProperty"
ListLink
ConceptNode "peanut butter jar"
PredicateNode "price"

where the

DefinedPredicateNode "hasQuantitativeProperty"
ListLInk
$Con
$Prop

is set up with DefineLink to mean

ForAllLink $X
ImplicationLink
InheritanceLink
$X
ConceptNode $Con
ThereExistsLink $P
EvaluationLink
PredicateNode $Prop
ListLink
ConceptNode $X
QuantityNode $P

So I guess

DefinedPredicateNode "hasQuantitativeProperty"

is the syntactic sugar you're looking for, maybe, but you would have to build it
(apologies the above syntax is not exact...)

ben

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--
Ben Goertzel, PhD
http://goertzel.org

“I tell my students, when you go to these meetings, see what direction
everyone is headed, so you can go in the opposite direction. Don’t
polish the brass on the bandwagon.” – V. S. Ramachandran

[Nil Geisweiller]

Guys, just wanted to point out this possibly relevant example

https://github.com/opencog/opencog/tree/master/examples/pln/which-product

Nil