Tue, 28 Aug 2018 11:13:33 +0200 wenzelm clarified ML_environment: ML_write_global requires "Isabelle";
Tue, 28 Aug 2018 10:58:43 +0200 wenzelm clarified signature: do not expose internal operation;
Mon, 27 Aug 2018 22:58:36 +0200 wenzelm some NEWS (instead of proper documentation);
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