Wed, 19 Apr 2017 16:24:59 +0200 wenzelm optionally explore all sessions -- potentially slow, e.g. for AFP;
Wed, 19 Apr 2017 16:22:20 +0200 wenzelm proper sections;
Wed, 19 Apr 2017 15:53:58 +0200 wenzelm clarified session structure: avoid ambiguity of file ~~/src/HOL/Library/Old_Datatype.thy;
Wed, 19 Apr 2017 12:27:36 +0200 wenzelm proper base name, e.g. relevant for Code_Namespace.hierarchical_program;
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