docs: def _write_properties_file(self):
          """Write an RDP training properties file manually.
          """
          # The properties file specifies the names of the files in the
          # training directory.  We use the example properties file
          # directly from the rdp_classifier distribution, which lists
          # the default set of files created by the application.  We
          # must write this file manually after generating the
          # training data.
          properties_fp = os.path.join(self.ModelDir, self.PropertiesFile)
          properties_file = open(properties_fp, 'w')
          properties_file.write(
              "# Sample ResourceBundle properties file\n"
              "bergeyTree=bergeyTrainingTree.xml\n"
              "probabilityList=genus_wordConditionalProbList.txt\n"
              "probabilityIndex=wordConditionalProbIndexArr.txt\n"
              "wordPrior=logWordPrior.txt\n"
              "classifierVersion=Naive Bayesian rRNA Classifier Version 1.0, "
              "November 2003\n"
          )
          properties_file.close()