Fix restrictions on Offer to allow for offers to buy in addition to offers to sell

[rjyounes]

This restriction does not work for offers to buy:

			[
				a owl:Restriction ;
				owl:onProperty gist:offers ;
				owl:someValuesFrom gist:CatalogItem ;
			]

[stevenchalem]

Investopedia defines "Offer" as follows

An offer is a conditional proposal made by a buyer or seller to buy or sell an asset, which becomes legally binding if accepted. An offer is also defined as the act of offering something for sale, or the submission of a bid to buy something.

[rjyounes]

Yes. The text definition includes both offers to buy and offers to sell, but the restriction does not allow for the former.

[rjyounes]

Michael: We need another restriction to indicate the other side of the offer (e.g., the buyer offers money for a house, the seller offers a house for money. The current restriction only captures the first.

DECISION:

gist:ContingentObligation
and (gist:hasGiver some 
    (gist:Organization or gist:Person))
and (gist:offersToProvide some owl:Thing) 
and (gist:offersToReceive some owl:Thing)
and (gist:plannedEndDateTime some 1 rdfs:Literal)
and (gist:plannedStartDateTime some 1 rdfs:Literal)

• Change definition to "A contingent commitment to buy, sell, or provide one described or identified good or service in exchange for another."

• Add scope notes/examples - one side will typically be monetary but not necessarily (swaps), one side could be $0 (e.g., donations). Another example: both sides could be monetary - currency exchanges.

• Remove predicate offers.

• Add two predicates, offersToProvide and offersToReceive.