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Version 1.0 was released on June 10, 2008 [79] and incorporates the changes made to the Office Open XML specification made during the current ISO/IEC standardization process. [80] Version 2 of the Open XML SDK supports validating Office Open XML documents against the Office Open XML schema, as well as searching in Office Open XML documents. [80]
Office Open XML (also informally known as OOXML) [5] is a zipped, XML-based file format developed by Microsoft for representing spreadsheets, charts, presentations and word processing documents. Ecma International standardized the initial version as ECMA-376.
Besides differences in the schema, there are several other differences between the earlier Office XML schema formats and Office Open XML. Whereas the data in Office Open XML documents is stored in multiple parts and compressed in a ZIP file conforming to the Open Packaging Conventions, Microsoft Office XML formats are stored as plain single monolithic XML files (making them quite large ...
Office Open XML uses distinctly named elements for each compatibility setting, each of which is declared in the schema. The repertoire of settings is thus limited — for new compatibility settings to be added, new elements may need to be declared, "potentially creating thousands of them, each having nothing to do with interoperability".
The Office Open XML format (OOXML), is an open and free document file format for saving and exchanging editable office documents such as text documents (including memos, reports, and books), spreadsheets, charts, and presentations.
Alternatively, Microsoft has made available a free add-on known as the Microsoft Office Compatibility Pack that lets Office open, edit, and save documents created under the newer 2007 format. [44] Office Open XML is based on XML and uses the ZIP file container. According to Microsoft, documents created in this format are up to 75% smaller than ...