ISO/IEC 19757-7:2020

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ISO/IEC 19757-7:2020 is a technical standard that specifies a Character Repertoire Description Language (CREPDL) for defining character repertoires in information technology. It is part of the ISO/IEC 19757 series, which deals with Document Schema Definition Languages (DSDL). Essentially, it provides a way to describe what characters are included in a specific character set, such as Unicode, and how they are used.