BS PD 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.
Cross References:
ISO/IEC 26300
ISO/IEC 29500-1
ISO/IEC 29500-2
ISO/IEC 29500-3
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