# Package org.apache.poi

- Class Summary
  Class | Description
  --- | ---
  POIDocument | This holds the common functionality for all POI Document classes.
  POIReadOnlyDocument | This holds the common functionality for all read-only POI Document classes, i.e.

- Exception Summary
  Exception | Description
  --- | ---
  EmptyFileException | Exception thrown if an Empty (zero byte) file is supplied
  EncryptedDocumentException |
  OldFileFormatException | Base class of all the exceptions that POI throws in the event that it's given a file that's older than currently supported.
  UnsupportedFileFormatException | Base class of all the exceptions that POI throws in the event that it's given a file that isn't supported

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