ISO/IEC TR 30114-1:2016 Preview
Information technology -- Extensions of Office Open XML file formats -- Part 1: Guidelines
ISO/IEC TR 30114-1:2016 gives guidelines for the use of extensibility mechanisms in ISO/IEC 29500 (Office Open XML). In particular, it makes clear which of these mechanisms supports lossless round tripping.
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ISO/IEC TR 30114-1:2016