--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/iflow.sig	Sun Apr 04 14:37:19 2010 -0400
@@ -0,0 +1,58 @@
+(* Copyright (c) 2010, 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.
+ *)
+
+signature IFLOW = sig
+
+    type lvar = int
+
+    datatype exp =
+             Const of Prim.t
+           | Var of int
+           | Lvar of int
+           | Func of string * exp list
+           | Recd of (string * exp) list
+           | Proj of exp * string
+           | Finish
+
+    datatype reln =
+             Sql of string
+           | Eq
+
+    datatype prop =
+             True
+           | False
+           | Unknown
+           | And of prop * prop
+           | Or of prop * prop
+           | Reln of reln * exp list
+           | Select of int * lvar * lvar * prop * exp
+
+    exception Summaries of (string * exp * prop * (exp * prop) list) list
+
+    val check : Mono.file -> unit
+
+end