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(*  Title:      HOL/ex/Join_Theory.thy
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    Author:     Makarius
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*)
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section \<open>Join theory content from independent (parallel) specifications\<close>
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theory Join_Theory
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  imports Main
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begin
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subsection \<open>Example template\<close>
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definition "test = True"
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lemma test: "test" by (simp add: test_def)
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subsection \<open>Specification as Isabelle/ML function\<close>
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ML \<open>
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  fun spec i lthy =
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    let
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      val b = Binding.name ("test" ^ string_of_int i)
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      val ((t, (_, def)), lthy') = lthy
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        |> Local_Theory.define ((b, NoSyn), ((Binding.empty, []), \<^term>\<open>True\<close>));
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      val th =
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        Goal.prove lthy' [] [] (HOLogic.mk_Trueprop t)
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          (fn {context = goal_ctxt, ...} => asm_full_simp_tac (goal_ctxt addsimps [def]) 1);
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      val (_, lthy'') = lthy' |> Local_Theory.note ((b, []), [th]);
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    in lthy'' end;
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\<close>
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subsection \<open>Example application\<close>
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setup \<open>
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  fn thy =>
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    let val forked_thys = Par_List.map (fn i => Named_Target.theory_map (spec i) thy) (1 upto 10)
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    in Context.join_thys forked_thys end
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\<close>
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term test1
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thm test1
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term test10
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thm test10
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end
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