The flow execution repository subsystem for saving, and restoring managed flow executions.
The central concept defined by this package is the
{@link org.springframework.webflow.execution.repository.FlowExecutionRepository}, representing
a persistent store for one or more FlowExecution objects that capture the state of
user conversations in a form that can be restored on subsequent requests.
Central subsystem interface responsible for the saving and restoring of flow
executions, where each flow execution represents a state of an active flow
definition.