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diff --git a/gs/base/gscsepr.h b/gs/base/gscsepr.h
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+/* Copyright (C) 2001-2006 Artifex Software, Inc.
+   All Rights Reserved.
+  
+   This software is provided AS-IS with no warranty, either express or
+   implied.
+
+   This software is distributed under license and may not be copied, modified
+   or distributed except as expressly authorized under the terms of that
+   license.  Refer to licensing information at http://www.artifex.com/
+   or contact Artifex Software, Inc.,  7 Mt. Lassen Drive - Suite A-134,
+   San Rafael, CA  94903, U.S.A., +1(415)492-9861, for further information.
+*/
+
+/* $Id$ */
+/* Client interface to Separation color */
+
+#ifndef gscsepr_INCLUDED
+#  define gscsepr_INCLUDED
+
+#include "gscspace.h"
+
+
+/*
+ * Separation color spaces.
+ *
+ * With the implementation of full DeviceN support, the API for creating
+ * A Separation color space object has changed.  Separation color spaces
+ * are treated as a single component version of a DeviceN color space.
+ * The /All separation and the /None separation are the only exceptions.
+ * The /All separation and the /None separation is each treated as its own
+ * case and thus forms the majority of the remaining Separation color space
+ * code.
+ *
+ * The earlier API which had a multi element cache has been removed.
+ * The tint transform procedure now is executed as required and must
+ * be executable without doing a call out.
+ */
+
+/*
+ * This routine constructs a new separation color space object.
+ */
+extern int gs_cspace_new_Separation(
+    gs_color_space **ppcs,
+    gs_color_space * palt_cspace,
+    gs_memory_t * pmem
+    );
+
+/* Set the Separation tint transformation procedure to a Function. */
+#ifndef gs_function_DEFINED
+typedef struct gs_function_s gs_function_t;
+#  define gs_function_DEFINED
+#endif
+int gs_cspace_set_sepr_proc(gs_color_space * pcspace,
+			int (*proc)(const float *,
+				    float *,
+				    const gs_imager_state *,
+				    void *
+				    ),
+			void *proc_data
+			);
+/*
+ * Set the Separation tint transformation procedure to a Function.
+ */
+int gs_cspace_set_sepr_function(const gs_color_space *pcspace,
+				    gs_function_t *pfn);
+/*
+ * If the Separation tint transformation procedure is a Function,
+ * return the function object, otherwise return 0.
+ */
+gs_function_t *gs_cspace_get_sepr_function(const gs_color_space *pcspace);
+
+#endif /* gscsepr_INCLUDED */