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diff --git a/src/data/case-sink.h b/src/data/case-sink.h
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+++ b/src/data/case-sink.h
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+/* PSPP - computes sample statistics.
+   Copyright (C) 1997-9, 2000, 2006 Free Software Foundation, Inc.
+   Written by Ben Pfaff <blp@gnu.org>.
+
+   This program is free software; you can redistribute it and/or
+   modify it under the terms of the GNU General Public License as
+   published by the Free Software Foundation; either version 2 of the
+   License, or (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful, but
+   WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+   02110-1301, USA. */
+
+#ifndef CASE_SINK_H
+#define CASE_SINK_H 1
+
+#include <stdbool.h>
+#include <stddef.h>
+
+struct ccase;
+struct dictionary;
+
+/* A case sink. */
+struct case_sink 
+  {
+    const struct case_sink_class *class;        /* Class. */
+    void *aux;          /* Auxiliary data. */
+    size_t value_cnt;   /* Number of `union value's in case. */
+  };
+
+/* A case sink class. */
+struct case_sink_class
+  {
+    const char *name;                   /* Identifying name. */
+    
+    /* Opens the sink for writing. */
+    void (*open) (struct case_sink *);
+                  
+    /* Writes a case to the sink. */
+    bool (*write) (struct case_sink *, const struct ccase *);
+    
+    /* Closes and destroys the sink. */
+    void (*destroy) (struct case_sink *);
+
+    /* Closes the sink and returns a source that can read back
+       the cases that were written, perhaps transformed in some
+       way.  The sink must still be separately destroyed by
+       calling destroy(). */
+    struct case_source *(*make_source) (struct case_sink *);
+  };
+
+extern const struct case_sink_class null_sink_class;
+
+struct case_sink *create_case_sink (const struct case_sink_class *,
+                                    const struct dictionary *,
+                                    void *);
+void free_case_sink (struct case_sink *);
+
+#endif /* case-sink.h */