These are the transaction abstraction's interfaces and classes. These types define a two-phase commit protocol for driving transactions in a distributed system. These types define the actors and actions in the protocol but not the transaction semantics or transaction participant interactions with the manager. These are defined by particular implementations of the `Transaction` and `NestableTransaction` interfaces. The default semantics and participant/manager interactions are defined in the subpackage `net.jini.core.transaction.server`. @see net.jini.core.transaction.server @see "Jini(TM) Transaction Specification"