Fri, 28 Dec 2018 16:58:27 +0100 wenzelm clarified sessions_deps, according to Isabelle/MMT usage;
Thu, 27 Dec 2018 17:15:40 +0100 wenzelm tuned signature: for other dump-like tools;
Thu, 27 Dec 2018 16:59:55 +0100 wenzelm unused;
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