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diff --git a/src/H5ACprivate.h b/src/H5ACprivate.h
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+/*-------------------------------------------------------------------------
+ * Copyright (C) 1997	National Center for Supercomputing Applications.
+ *                      All rights reserved.
+ *
+ *-------------------------------------------------------------------------
+ *
+ * Created:		H5ACprivate.h
+ * 			Jul  9 1997
+ * 			Robb Matzke <robb@maya.nuance.com>
+ *
+ * Purpose:		Constants and typedefs available to the rest of the
+ *			library.
+ *
+ * Modifications:	
+ *
+ *-------------------------------------------------------------------------
+ */
+#ifndef _H5ACprivate_H
+#define _H5ACprivate_H
+
+#include "H5ACproto.h"		/*public prototypes			*/
+#include "H5Fprivate.h"		/*for private hdf5_file_t definition 	*/
+
+/*
+ * Class methods pertaining to caching.  Each type of cached object will
+ * have a constant variable with permanent life-span that describes how
+ * to cache the object.  That variable will be of type H5AC_class_t and
+ * have the following required fields...
+ *
+ * LOAD:	Loads an object from disk to memory.  The function
+ *		should allocate some data structure and return it.
+ *
+ * FLUSH:	Writes some data structure back to disk.  It would be
+ *		wise for the data structure to include dirty flags to
+ *		indicate whether it really needs to be written.  This
+ *		function is also responsible for freeing memory allocated
+ *		by the LOAD method if the DEST argument is non-zero.
+ */
+typedef struct H5AC_class_t {
+   void		*(*load)(hdf5_file_t*, off_t addr, const void *udata);
+   herr_t	(*flush)(hdf5_file_t*, hbool_t dest, off_t addr, void *thing);
+} H5AC_class_t;
+
+/*
+ * A cache has a certain number of entries.  Objects are mapped into a
+ * cache entry by hashing the object's file address.  Each file has its
+ * own cache, an array of slots.
+ */
+#define H5AC_NSLOTS	1033	/*prime number tend to work best	*/
+
+typedef struct H5AC_cache_t {
+   const H5AC_class_t *type;	/*type of object stored here		*/
+   off_t	addr;		/*file address for object		*/
+   void		*thing;		/*the thing which is cached		*/
+} H5AC_cache_t;
+
+/*
+ * Library prototypes.
+ */
+herr_t H5AC_dest (hdf5_file_t *f);
+void *H5AC_find (hdf5_file_t *f, const H5AC_class_t *type, off_t addr,
+		 const void *udata);
+herr_t H5AC_flush (hdf5_file_t *f, const H5AC_class_t *type, off_t addr,
+		   hbool_t destroy);
+herr_t H5AC_new (hdf5_file_t *f);
+herr_t H5AC_rename (hdf5_file_t *f, const H5AC_class_t *type,
+		    off_t old, off_t new);
+herr_t H5AC_set (hdf5_file_t *f, const H5AC_class_t *type, off_t addr,
+		 void *thing);
+
+#endif /* !_H5ACprivate_H */