Fri, 05 Aug 2022 13:34:47 +0200 wenzelm clarified session name: treat PIDE session as Sessions.DRAFT with imports from other sessions;
Fri, 05 Aug 2022 13:23:52 +0200 wenzelm more robust build_hierarchy: support Resources.empty / Sessions.Structure.empty (required for Build_Job.print_log);
Thu, 04 Aug 2022 22:15:50 +0200 wenzelm clarified context for retrieval: more explicit types, with optional close() operation;
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