             project_id : undefined
             path       : undefined
             save_interval : undefined
+            file_use_interval : undefined
             default    : ''
         super
             string_id  : opts.id
             client     : opts.client
             project_id : opts.project_id
             path       : opts.path
-            save_interval : opts.save_interval
+            save_interval     : opts.save_interval
+            file_use_interval : opts.file_use_interval
             doc        : new StringDocument(opts.default)
 
 

        @_patch_list.show_history(opts)

    get_path: =>
        return @_syncstring_table.get_one().get('path')

    get_project_id: =>
        return @_syncstring_table.get_one().get('project_id')

    set_path: (path) =>
        @_syncstring_table.set(@_syncstring_table.get_one().set('path',path))

    _save_to_disk: () =>
        path = @get_path()
        dbg = @dbg("_save_to_disk('#{path}')")
        if not path?
            # not yet initialized
            return
        if not path
            @_set_save(state:'done', error:'cannot save without path')
            return
