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| # POI-OpenXML4J - Java API To Access Office Open XML documents ### Overview OpenXML4J is the POI Project's pure Java implementation of the Open Packaging Conventions (OPC) defined in ECMA-376. Every OpenXML file comprises a collection of byte streams called parts, combined into a container called a package. POI OpenXML4J provides a physical implementation of the OPC that uses the Zip file format. ### History OpenXML4J was originally developed by http://openxml4j.org/ and contributed to POI in 2008. Thanks to the support and guidance of Julien Chable