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Entity > Abstract > Proposition > NormativeProposition > Promise > Contract > PurchaseContract

PurchaseContract
subject			fact

PurchaseContract	documentation A Contract between two Agents in which one Agent agrees to render the other some good or service in exchange for currency
	is a kind of Contract
Proposition	has axiom (=> (instance ?SENTENCE Sentence) (exists (?PROP) (and (instance ?PROP Proposition) (containsInformation ?SENTENCE ?PROP))))
	is second domain of containsInformation
	is second domain of realization
Abstract	is disjoint from Physical
Entity	is first domain of documentation
	is first domain of element
	is first domain of equal
	is first domain of IdentityFn
	is first domain of instance
	is first domain of relatedExternalConcept
	is first domain of relatedInternalConcept