Sun, 03 Mar 2019 20:27:42 +0100 wenzelm tuned signature;
Sun, 03 Mar 2019 20:13:25 +0100 wenzelm clarified signature -- allow more re-use;
Sun, 03 Mar 2019 19:30:17 +0100 wenzelm concrete predicates from "Dublin Core";
Sun, 03 Mar 2019 19:12:28 +0100 wenzelm clarified signature;
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