The format was initially standardised by Ecma (as ECMA-376) and, in later versions, by ISO and IEC (as ISO/IEC 29500).
Office Open XML (OOXML, DOCX, проект ISO/IEC IS 29500:2008) — серия форматов файлов для хранения электронных документов пакетов офисных приложений — в частности, Microsoft Office.