# Package org.springframework.batch.sample.domain.multiline

- Class Summary
  Class | Description
  --- | ---
  AggregateItem<T> | A wrapper type for an item that is used by `AggregateItemReader` to identify the start and end of an aggregate record.
  AggregateItemFieldSetMapper<T> | Delegating mapper to convert form a vanilla `FieldSetMapper` to one that returns `AggregateItem` instances for consumption by the `AggregateItemReader`.
  AggregateItemReader<T> | An `ItemReader` that delivers a list as its item, storing up objects from the injected `ItemReader` until they are ready to be packed out as a collection.