A type defining swap streams and additional payments between the principal parties involved in the swap. The swap streams. Parameters specifying provisions relating to the optional and mandatory early terminarion of a swap transaction. A provision that allows the specification of an embedded option within a swap giving the buyer of the option the right to terminate the swap, in whole or in part, on the early termination date. A provision that allows the specification of an embedded option with a swap giving the buyer of the option the right to extend the swap, in whole or in part, to the extended termination date. Additional payments between the principal parties. Contains any additional terms to the swap contract. The base type which all FpML products extend.