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diff --git a/lib/pdf/object.hh b/lib/pdf/object.hh
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+//  object.hh -- PDF objects
+//  Copyright (C) 2008  SEIKO EPSON CORPORATION
+//
+//  This file is part of the 'iscan' program.
+//
+//  The 'iscan' program is free-ish 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 FITNESS
+//  FOR A PARTICULAR PURPOSE or MERCHANTABILITY.
+//  See the GNU General Public License for more details.
+//
+//  You should have received a verbatim copy of the GNU General Public
+//  License along with this program; if not, write to:
+//
+//      Free Software Foundation, Inc.
+//      59 Temple Place, Suite 330
+//      Boston, MA  02111-1307  USA
+//
+//  As a special exception, the copyright holders give permission
+//  to link the code of this program with the esmod library and
+//  distribute linked combinations including the two.  You must obey
+//  the GNU General Public License in all respects for all of the
+//  code used other than esmod.
+
+#ifndef iscan_pdf_object_hh_included
+#define iscan_pdf_object_hh_included
+
+#ifndef __cplusplus
+#error "This is a C++ header file; use a C++ compiler to compile it."
+#endif
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <cstdlib>
+#include <cstdio>
+
+namespace iscan
+{
+
+namespace pdf
+{
+
+using namespace std;
+
+/*! A base class for all pdf objects [p 51].
+ *
+ * A pdf::object is also used to pass around object numbers in a transparent
+ * fashion so that object references can be output correctly as elements of
+ * arrays and dictionaries.
+ */
+class object
+{
+private:
+
+  size_t _obj_num;
+  static size_t next_obj_num; // the next free object number
+
+public:
+
+  object ();
+
+  /*! Creates a new pdf::object with its object number set to \a num.
+   *
+   *  Constructs an indirect object.
+   */
+  object (size_t num);
+
+  virtual ~object (void);
+
+  /*! Obtain the pdf::object's object number.
+   *
+   * If the object has not been allocated an object number yet, a new one is
+   * allocated and returned.
+   */
+  size_t obj_num ();
+
+  /*! Determine whether the object is direct or indirect [p 63].
+   *
+   *  Probably don't need this method.
+   *
+   *  @return True if the object is direct, False if it is indirect
+   */
+  bool is_direct () const;
+
+  /*! Output the object contents.
+   *
+   *  In the case of pdf::object, this only outputs an indirect reference to
+   *  itself [p 64].
+   *
+   *  Each subclass re-implements this in order to print its own content.
+   *  It should only ever output the object contents, ommitting the object
+   *  definition header and footer [p 64]
+   */
+  virtual void print (FILE* fp) const;
+
+  /*! Compare the contents of two pdf::objects.
+   *
+   * Only the object contents are compared, the object number of the two
+   * objects can be different.
+   *
+   * In the case of pdf::object, the object numbers are compared.
+   */
+  virtual bool operator== (object& that) const;
+  
+  /*! Reset the current object number to recycle them for new documents
+   */
+  static void reset_object_numbers ();
+
+};
+
+}       // namespace pdf
+}       // namespace iscan
+
+#endif  // iscan_pdf_object_hh_included