I am sorry it seems it satisfies the following
 
(2.1) — a namespace-scope declaration declared within an export-declaration, or
 
 
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>Вторник, 15 февраля 2022, 0:33 +03:00 от Vladimir Grigoriev via Std-Discussion <std-discussion_at_[hidden]>:
>
>In the section « 10.2 Export declaration» of the C++ 20 Standard there is written
>
>2 A declaration is exported if it is
>(2.2) — a namespace-definition that contains an exported declaration, or
>
>But then there is followed an example
>
>export namespace N { } // OK
>
>but this namespace definition does not contain an exported declaration. It is an empty namespace definition.
>
>So is there a contradiction?
>
>You can meet me at http://cpp.forum24.ru/ or www.stackoverflow.com or http://ru.stackoverflow.com
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