2011-04-16 ago modernized structure Proof_Context;
2010-09-12 ago eliminated aliases of Type.constraint;
2010-05-27 ago renamed structure TypeInfer to Type_Infer, keeping the old name as legacy alias for some time;
2010-05-17 ago renamed structure OuterLex to Token and type token to Token.T, keeping legacy aliases for some time;
2010-05-15 ago refer directly to structure Keyword and Parse;
2009-11-01 ago modernized structure Rule_Cases;
2009-10-29 ago standardized filter/filter_out;
2009-09-30 ago eliminated redundant bindings;
2009-07-09 ago renamed structure TermSubst to Term_Subst;
2009-07-06 ago structure Thm: less pervasive names;
2009-03-28 ago renamed ProofContext.add_fixes_i to ProofContext.add_fixes, eliminated obsolete external version;
2009-03-26 ago simplified attribute and method setup: eliminating bottom-up styles makes it easier to keep things in one place, and also SML/NJ happy;
2009-03-16 ago method parser: pass proper context;
2009-03-16 ago export method parser;
2009-03-15 ago simplified attribute setup;
2009-03-13 ago simplified method setup;
2009-03-13 ago unified type Proof.method and pervasive METHOD combinators;
2009-01-21 ago removed Ids;
2008-12-04 ago cleaned up binding module and related code
2008-09-02 ago explicit type Name.binding for higher-specification elements;
2008-08-15 ago Args.name_source(_position) for proper position information;
2008-08-09 ago unified Args.T with OuterLex.token, renamed some operations;
2008-06-28 ago tuned;
2008-06-19 ago private add_used (from drule.ML);
2008-06-16 ago added instantiate_tac, cut_inst_tac, forw_inst_tac, dres_inst_tac, make_elim_preserve (from tactic.ML);
2008-06-16 ago added read_instantiate;
2008-06-14 ago export subgoal_tac, subgoals_tac, thin_tac;
2008-06-10 ago added (e)res_inst_tac;
2008-03-28 ago Context.>> : operate on Context.generic;
2008-03-27 ago eliminated delayed theory setup
2007-11-08 ago where/of: do not allow schematic variables here!
2007-11-07 ago Syntax.read_typ;
2007-11-07 ago attribute where/of: proper Syntax.parse/check;
2007-04-15 ago proper ProofContext.infer_types;
2007-04-14 ago cleaned/simplified Sign.read_typ, Thm.read_cterm etc.;
2006-12-18 ago switched argument order in *.syntax lifters
2006-11-23 ago renamed Args.Name to Args.Text;
2006-09-15 ago renamed Term.map_term_types to Term.map_types (cf. Term.fold_types);
2006-09-12 ago moved term subst functions to TermSubst;
2006-09-06 ago read_instantiate: declare names of TVars as well (temporary workaround for no-freeze feature of type inference);
2006-08-05 ago reworked read_instantiate -- separate read_insts;
2006-08-03 ago Rule instantiations -- operations within a rule/subgoal context.