+#define _xml(X) (CHAR_CAST (const xmlChar *, (X)))
+
+#define _xmlchar_to_int(X) ((X) ? atoi (CHAR_CAST (const char *, (X))) : -1)
+
+struct sheet_detail
+{
+ /* The name of the sheet (utf8 encoding) */
+ char *name;
+
+ /* The extents of the sheet. */
+ int first_col;
+ int last_col;
+ int first_row;
+ int last_row;
+};
+
+struct spreadsheet
+{
+ /** General spreadsheet object related things. */
+ int ref_cnt;
+
+ /* A 3 letter string (null terminated) which identifies the type of
+ spreadsheet (eg: "ODS" for opendocument; "GNM" for gnumeric etc). */
+ char type[4];
+
+ void (*destroy) (struct spreadsheet *);
+ struct casereader* (*make_reader) (struct spreadsheet *,
+ const struct spreadsheet_read_options *);
+ const char * (*get_sheet_name) (struct spreadsheet *, int);
+ char * (*get_sheet_range) (struct spreadsheet *, int);
+ int (*get_sheet_n_sheets) (struct spreadsheet *);
+ unsigned int (*get_sheet_n_rows) (struct spreadsheet *, int);
+ unsigned int (*get_sheet_n_columns) (struct spreadsheet *, int);
+ char * (*get_sheet_cell) (struct spreadsheet *, int , int , int);
+
+ char *file_name;
+
+ struct sheet_detail *sheets;
+
+
+ /** Things specific to casereaders. */
+
+ /* The dictionary for client's reference.
+ Client must ref or clone it if it needs a permanent or modifiable copy. */
+ struct dictionary *dict;
+ struct caseproto *proto;
+ struct ccase *first_case;
+ bool used_first_case;
+
+ /* Where the reader should start and stop. */
+ int start_row;
+ int start_col;
+ int stop_row;
+ int stop_col;
+};
+
+
+struct casereader * spreadsheet_make_reader (struct spreadsheet *, const struct spreadsheet_read_options *);
+
+const char * spreadsheet_get_sheet_name (struct spreadsheet *s, int n) OPTIMIZE(2);
+char * spreadsheet_get_sheet_range (struct spreadsheet *s, int n) OPTIMIZE(2);
+int spreadsheet_get_sheet_n_sheets (struct spreadsheet *s) OPTIMIZE(2);
+unsigned int spreadsheet_get_sheet_n_rows (struct spreadsheet *s, int n) OPTIMIZE(2);
+unsigned int spreadsheet_get_sheet_n_columns (struct spreadsheet *s, int n) OPTIMIZE(2);
+
+char * spreadsheet_get_cell (struct spreadsheet *s, int n, int row, int column);
+
+char * create_cell_ref (int col0, int row0);
+char *create_cell_range (int col0, int row0, int coli, int rowi);
+
+struct spreadsheet * spreadsheet_ref (struct spreadsheet *s) WARN_UNUSED_RESULT;
+void spreadsheet_unref (struct spreadsheet *);