           model: @
         callback(view)
 
-
   # Mix in the loadable
   PackageFile = PackageFile.extend loadable

      # **TODO:** Fall back on `toc.ncx` and then the `spine` to create a navTree if one does not exist
      return {title: title, bookId: bookId}

    serialize: () -> serializer.serializeToString(@$xml[0])

    newNode: (options) ->
      model = options.model


            path = Utils.resolvePath(contextPath, href)
            contentModel = allContent.get path
            throw new Error 'ERROR: File in nav missing in OPF' if not contentModel

            # Set all the titles of models in the workspace based on the nav tree
            # XhtmlModel titles are not saved anyway.
