Sun, 08 Sep 2019 16:49:05 +0200 wenzelm declare session directories;
Sun, 08 Sep 2019 13:07:03 +0200 wenzelm clarified signature: proper Document.Node.Ordering conforming to equality (e.g. required in situations where theory names are ambiguous due to overlapping session directories);
Sat, 07 Sep 2019 19:52:36 +0200 wenzelm theory_name based on session_directories: no need for expensive all_known;
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