docs: private void processElementNormal(GeneratorSingleCluster cluster, Node cur) {
      double mean = 0.0;
      double stddev = 1.0;
      String meanstr = ((Element) cur).getAttribute(ATTR_MEAN);
      if(meanstr != null && meanstr.length() > 0) {
        mean = ParseUtil.parseDouble(meanstr);
      }
      String stddevstr = ((Element) cur).getAttribute(ATTR_STDDEV);
      if(stddevstr != null && stddevstr.length() > 0) {
        stddev = ParseUtil.parseDouble(stddevstr);
      }
  
      // *** New normal distribution generator
      Random random = cluster.getNewRandomGenerator();
      Distribution generator = new NormalDistribution(mean, stddev, random);
      cluster.addGenerator(generator);
  
      // TODO: check for unknown attributes.
      XMLNodeIterator iter = new XMLNodeIterator(cur.getFirstChild());
      while(iter.hasNext()) {
        Node child = iter.next();
        if(child.getNodeType() == Node.ELEMENT_NODE) {
          LOG.warning("Unknown element in XML specification file: " + child.getNodeName());
        }
      }
    }