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diff --git a/src/data/por-file-writer.h b/src/data/por-file-writer.h
new file mode 100644
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--- /dev/null
+++ b/src/data/por-file-writer.h
@@ -0,0 +1,53 @@
+/* PSPP - computes sample statistics.
+   Copyright (C) 1997-9, 2000 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 PFM_WRITE_H
+#define PFM_WRITE_H
+
+#include <stdbool.h>
+
+/* Portable file writing. */
+
+/* Portable file types. */
+enum pfm_type
+  {
+    PFM_COMM,   /* Formatted for communication. */
+    PFM_TAPE    /* Formatted for tape. */
+  };
+
+/* Portable file writing options. */
+struct pfm_write_options 
+  {
+    bool create_writeable;      /* File perms: writeable or read/only? */
+    enum pfm_type type;         /* Type of portable file (TODO). */
+    int digits;                 /* Digits of precision. */
+  };
+
+struct file_handle;
+struct dictionary;
+struct ccase;
+struct pfm_writer *pfm_open_writer (struct file_handle *, struct dictionary *,
+                                    struct pfm_write_options);
+struct pfm_write_options pfm_writer_default_options (void);
+
+int pfm_write_case (struct pfm_writer *, const struct ccase *);
+bool pfm_write_error (const struct pfm_writer *);
+bool pfm_close_writer (struct pfm_writer *);
+
+#endif /* por-file-writer.h */