Thu, 11 Nov 2021 13:18:35 +0100 wenzelm tuned signature;
Thu, 11 Nov 2021 13:14:12 +0100 wenzelm clarified signature: more explicit class Entity_Context with private state + operations;
Thu, 11 Nov 2021 12:16:17 +0100 wenzelm more hyperlinks, notably internal fact references;
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