In rem jurisdiction is a legal term describing the power a court may exercise over property or a "status" against a person over whom the court does not have in personam jurisdiction
It is an empowerment of one person or body with legal right or power to perform a specific action.
Where a mistake of both parties at the time the contract was made to a basic assumption on which the contract was made has a material effect on the agreed exchange of performances, then the contract is voidable.
Constructive means something which is interpreted or legally imputed.
