src/Pure/term_xml.ML

 signature TERM_XML_OPS =
 sig
   type 'a T
   val sort: sort T
   val typ: typ T
-  val term: term T
+  val term: Consts.T -> term T
+  val term_raw: term T
 end
 
 signature TERM_XML =
 sig
   structure Encode: TERM_XML_OPS

 fun typ T = T |> variant
  [fn Type (a, b) => ([a], list typ b),
   fn TFree (a, b) => ([a], sort b),
   fn TVar ((a, b), c) => ([a, int_atom b], sort c)];
 
-fun term t = t |> variant
+fun term consts t = t |> variant
+ [fn Const (a, b) => ([a], list typ (Consts.typargs consts (a, b))),
+  fn Free (a, b) => ([a], typ b),
+  fn Var ((a, b), c) => ([a, int_atom b], typ c),
+  fn Bound a => ([int_atom a], []),
+  fn Abs (a, b, c) => ([a], pair typ (term consts) (b, c)),
+  fn op $ a => ([], pair (term consts) (term consts) a)];
+
+fun term_raw t = t |> variant
  [fn Const (a, b) => ([a], typ b),
   fn Free (a, b) => ([a], typ b),
   fn Var ((a, b), c) => ([a, int_atom b], typ c),
   fn Bound a => ([int_atom a], []),
-  fn Abs (a, b, c) => ([a], pair typ term (b, c)),
-  fn op $ a => ([], pair term term a)];
+  fn Abs (a, b, c) => ([a], pair typ term_raw (b, c)),
+  fn op $ a => ([], pair term_raw term_raw a)];
 
 end;
 
 structure Decode =
 struct

 fun typ T = T |> variant
  [fn ([a], b) => Type (a, list typ b),
   fn ([a], b) => TFree (a, sort b),
   fn ([a, b], c) => TVar ((a, int_atom b), sort c)];
 
-fun term t = t |> variant
+fun term consts t = t |> variant
+ [fn ([a], b) => Const (a, Consts.instance consts (a, list typ b)),
+  fn ([a], b) => Free (a, typ b),
+  fn ([a, b], c) => Var ((a, int_atom b), typ c),
+  fn ([a], []) => Bound (int_atom a),
+  fn ([a], b) => let val (c, d) = pair typ (term consts) b in Abs (a, c, d) end,
+  fn ([], a) => op $ (pair (term consts) (term consts) a)];
+
+fun term_raw t = t |> variant
  [fn ([a], b) => Const (a, typ b),
   fn ([a], b) => Free (a, typ b),
   fn ([a, b], c) => Var ((a, int_atom b), typ c),
   fn ([a], []) => Bound (int_atom a),
-  fn ([a], b) => let val (c, d) = pair typ term b in Abs (a, c, d) end,
-  fn ([], a) => op $ (pair term term a)];
+  fn ([a], b) => let val (c, d) = pair typ term_raw b in Abs (a, c, d) end,
+  fn ([], a) => op $ (pair term_raw term_raw a)];
 
 end;
 
 end;