exported suffix

--- a/src/Pure/axclass.ML	Mon Mar 10 21:51:43 2008 +0100
+++ b/src/Pure/axclass.ML	Mon Mar 10 21:51:44 2008 +0100
@@ -40,6 +40,7 @@
   type cache
   val of_sort: theory -> typ * sort -> cache -> thm list * cache  (*exception Sorts.CLASS_ERROR*)
   val cache: cache
+  val introN: string
   val axiomsN: string
 end;