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# POI Documentation

HSSF
org.apache.poi.hssf.contrib.view
org.apache.poi.hssf.dev: DEV package serves two purposes.
org.apache.poi.hssf.eventmodel
org.apache.poi.hssf.eventusermodel: HSSF eventmodel Package provides an event-based API for reading HSSF files.
org.apache.poi.hssf.model: Provides low level API structures for reading, writing, modifying XLS files.
org.apache.poi.hssf.record: Record package contains class representations for XLS binary strutures.
org.apache.poi.hssf.record.aggregates: record aggregates are not real "records" but collections of records that act as a single record.
org.apache.poi.hssf.record.formula: formula package contains binary PTG structures used in Formulas (not yet supported!)
org.apache.poi.hssf.usermodel: usermodel package maps HSSF low level strutures to familiar workbook/sheet model
org.apache.poi.hssf.usermodel.contrib
org.apache.poi.hssf.util: util package contains tools needed for writing HSSF files that are not necesarily "real" HSSF concepts.

HPSF
org.apache.poi.hpsf: Horrible PropertySet Format API reads things like Document Summary info from OLE 2 Compound document files.
org.apache.poi.hpsf.wellknown: Specific support for DocumentSummaryInformation, SummaryInformation types.

POIFS
org.apache.poi.poifs.common: common package contains constants and other classes shared across all POIFS subpackages
org.apache.poi.poifs.dev: DEV package serves two purposes.
org.apache.poi.poifs.eventfilesystem: The eventfilesystem is an efficient method for reading OLE 2 CDF files.
org.apache.poi.poifs.filesystem: filesystem package maps OLE 2 Compound document files to a more familiar filesystem interface.
org.apache.poi.poifs.property: property package contains high and low level Property structures for POIFS.
org.apache.poi.poifs.storage: storage package contains low level binary structures for POIFS's implementation of the OLE 2 Compound Document Format.

HDF
org.apache.poi.hdf.event
org.apache.poi.hdf.extractor
org.apache.poi.hdf.extractor.data
org.apache.poi.hdf.extractor.util
org.apache.poi.hdf.generator
org.apache.poi.hdf.model
org.apache.poi.hdf.model.hdftypes
org.apache.poi.hdf.model.hdftypes.definitions
org.apache.poi.hdf.model.util

Utils
org.apache.poi.util: Top-level util package are classes that are useful throughout the project.

Other Packages
org.apache.poi.contrib.metrics
org.apache.poi.contrib.poibrowser
org.apache.poi.ddf: This package contains classes for decoding the Microsoft Office Drawing format otherwise known as escher henceforth known in POI as the Dreadful Drawing Format.
org.apache.poi.dev
org.apache.poi.generator

Copyright © 2003 Apache Software Foundation.