The .xlsx format is a proprietary format defined and controlled by Microsoft Corporation, a private entity incorporated in the United States. In fact, although OOXML (ISO/IEC 29500) has been approved as a standard, its implementation has never complied with the specifications of the standard itself, as widely documented in the literature on interoperability. Requiring participants to use this format as the sole vehicle for structured data entry effectively conditions participation in a public consultation on the availability or willingness to use software produced by a single supplier.
Note: Accessing a key that doesn’t exist is a runtime error. Always use .has() or iterate with for when keys are dynamic.
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