* to {@link #properties}, {@link #measurementScales}
     * @param descriptor reads the descriptor.
     */
    public void addMeasurementInfos(Reader descriptor) {
                                                  
       MeasurementsDescriptorParser parser = new MeasurementsDescriptorParser();
       
       Map<String, MeasurableProperty> digestedProperties = new HashMap<String, MeasurableProperty>();
       Map<String, Metric> digestedMetrics = new HashMap<String, Metric>();
        
       parser.load(descriptor, digestedProperties, digestedMetrics);
       
       // merge digested properties with already existing
       for (MeasurableProperty p : digestedProperties.values()) {
           MeasurementInfo helperInfo = new MeasurementInfo(); 
           helperInfo.setMetric(null);