(g) `contract of sale` means a contract for the sale of property by a seller to a buyer which is not an agreement within the meaning of point (a); (j) `debtor` means an auditor under a collateral agreement, a conditional buyer under a retention-of-title contract, a lessee under a lease or a person whose interest in an asset is compromised by a non-consensual right or interest that may be registered; Under a contract of sale concluded under an aircraft purchase contract or an engine contract, Cape Town also allows the buyer to declare its interest in these engines to the International Registry, as if the sale were an international interest. .