+gchar *
+g_sheet_column_get_subtitle (const GSheetColumn *column, glong col)
+{
+ g_return_val_if_fail (G_IS_SHEET_COLUMN (column), NULL);
+
+ if ( ! G_SHEET_COLUMN_GET_IFACE (column)->get_subtitle)
+ return NULL;
+
+ return (G_SHEET_COLUMN_GET_IFACE (column)->get_subtitle) (column, col);
+}