--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/expl.sml	Thu Jun 19 10:06:59 2008 -0400
@@ -0,0 +1,102 @@
+(* Copyright (c) 2008, Adam Chlipala
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * - Redistributions of source code must retain the above copyright notice,
+ *   this list of conditions and the following disclaimer.
+ * - Redistributions in binary form must reproduce the above copyright notice,
+ *   this list of conditions and the following disclaimer in the documentation
+ *   and/or other materials provided with the distribution.
+ * - The names of contributors may not be used to endorse or promote products
+ *   derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *)
+
+structure Expl = struct
+
+type 'a located = 'a ErrorMsg.located
+
+datatype kind' =
+         KType
+       | KArrow of kind * kind
+       | KName
+       | KRecord of kind
+
+withtype kind = kind' located
+
+datatype con' =
+         TFun of con * con
+       | TCFun of string * kind * con
+       | TRecord of con
+
+       | CRel of int
+       | CNamed of int
+       | CModProj of int * string list * string
+       | CApp of con * con
+       | CAbs of string * kind * con
+
+       | CName of string
+
+       | CRecord of kind * (con * con) list
+       | CConcat of con * con
+
+withtype con = con' located
+
+datatype exp' =
+         EPrim of Prim.t
+       | ERel of int
+       | ENamed of int
+       | EModProj of int * string list * string
+       | EApp of exp * exp
+       | EAbs of string * con * con * exp
+       | ECApp of exp * con
+       | ECAbs of string * kind * exp
+
+       | ERecord of (con * exp * con) list
+       | EField of exp * con * { field : con, rest : con }
+
+withtype exp = exp' located
+
+datatype sgn_item' =
+         SgiConAbs of string * int * kind
+       | SgiCon of string * int * kind * con
+       | SgiVal of string * int * con
+       | SgiStr of string * int * sgn
+
+and sgn' =
+    SgnConst of sgn_item list
+  | SgnVar of int
+
+withtype sgn_item = sgn_item' located
+and sgn = sgn' located
+
+datatype decl' =
+         DCon of string * int * kind * con
+       | DVal of string * int * con * exp
+       | DSgn of string * int * sgn
+       | DStr of string * int * sgn * str
+
+     and str' =
+         StrConst of decl list
+       | StrVar of int
+       | StrProj of str * string
+
+withtype decl = decl' located
+     and str = str' located
+
+type file = decl list
+
+end