The OpenDocument format (ODF), an abbreviation for the OASIS Open Document Format for Office Applications, is an open and free (excluding maintenance and support)[1] document file format for saving and exchanging editable office documents such as text documents (including memos, reports, and books), spreadsheets, databases, charts, and presentations.
This standard was developed by the OASIS industry consortium, based upon the XML-based file format originally created by OpenOffice.org, and ODF was approved as an OASIS standard on May 1, 2005.
[2] Besides word processors, other programs can and do support the OpenDocument text format.
If the file has a version known to an XML processor, it may validate the document.
Informations from OpenDocument specification [4] Following table contains list of ODF specification version attribute office:version="1.X" used in files exported from OpenDocument software.