code: private void processRangeOptions(final Map<String, String> properties) {
      final String featuresRange = properties.get("range");
      final String[] rangeArray = Flags
          .processLemmaBaselineFeaturesRange(featuresRange);
      if (rangeArray[0].equalsIgnoreCase("pos")) {
        this.isPos = true;
      }
      if (rangeArray[1].equalsIgnoreCase("posclass")) {
        this.isPosClass = true;
      }
      this.attributes = properties;
    }
docs: Process the options of which kind of features are to be generated.
  
  @param properties
  the properties map