src/ZF/Datatype_ZF.thy
2008-05-18 wenzelm moved global pretty/string_of functions from Sign to Syntax;
2008-05-17 wenzelm structure Display: less pervasive operations;
2008-03-29 wenzelm replaced 'ML_setup' by 'ML';
2008-02-11 krauss Made theory names in ZF disjoint from HOL theory names to allow loading both developments
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