Fri, 05 Aug 2022 20:54:39 +0200 wenzelm clarified Document.Snapshot.all_exports: refer to material from this (virtual) session;
Fri, 05 Aug 2022 19:02:38 +0200 wenzelm clarified database query: refer to semantic theories;
Fri, 05 Aug 2022 18:45:49 +0200 wenzelm clarified signature: more operations;
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