(* Title:  BaseDefinitions/model-pattern.sml

   Author: Walther Neuper

   (c) due to copyright terms

A pattern to be combined with a formalisation (Formalise.T) yielding an O_Model.T..

*)

signature MODEL_PATTERN =

sig

  type T

  type single

  val to_string: single list -> string

  type m_field = string

  type descriptor = term

(* ---- for tests only: shifted from below to remove the Warning "unused" at fun.def. --------- *)

  val to_string': T -> string

(*/-------------------------------------------------------- ! aktivate for Test_Isac BEGIN ---\* )

  (*NONE*)                                                                      

( *\--- ! aktivate for Test_Isac END ----------------------------------------------------------/*)

end

(**)

structure Model_Pattern(**): MODEL_PATTERN(**) =

struct

(**)

(* the pattern for an item of a problems model or a methods guard *)

type m_field = string;

type descriptor = term;

type single =

  (m_field *      (* field Given, Find, Relate *)

	  (descriptor * (* for snd term              *)

	     term))     (* id | arbitrary term       *);

type T = single list;

fun pat2str (field, (dsc, id)) = pair2str (field, pair2str (UnparseC.term dsc, UnparseC.term id));

fun to_string pats = (strs2str o (map pat2str)) pats;

fun pat2str' (field, (dsc, id)) = pair2str (field, pair2str (UnparseC.term dsc, UnparseC.term id)) ^ "\n";

fun to_string' pats = (strs2str o (map pat2str')) pats;

(**)end(**)