gchar *folder_item_get_cache_file (FolderItem *item);
gchar *folder_item_get_mark_file (FolderItem *item);
gchar * folder_item_get_identifier (FolderItem * item);
gchar *folder_item_get_cache_file (FolderItem *item);
gchar *folder_item_get_mark_file (FolderItem *item);
gchar * folder_item_get_identifier (FolderItem * item);