ISO/IEC TR 30114-1:2016

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ISO/IEC TR 30114-1:2016 is a technical report from the International Organization for Standardization (ISO) and the International Electrotechnical Commission (IEC) that provides guidelines for using extensibility mechanisms in the Office Open XML (OOXML) standard, specifically focusing on which mechanisms support lossless round tripping. It essentially clarifies how to extend OOXML files without losing data when they are opened and saved again by different application.