Mon, 28 May 2018 21:29:03 +0200 wenzelm more accurate theory_graph: avoid imports of loaded_theories with incomplete node name;
Mon, 28 May 2018 17:40:34 +0200 wenzelm clarified signature: Known.theories retains Document.Node.Entry (with header);
Mon, 28 May 2018 13:35:43 +0200 wenzelm clarified signature;
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