code: @Override
      public Xml child(String name) {
          List<Xml> children = children(name);
          if (children.size() != 1) {
              logger.debug("Could not find individual child node: " + name);
              return new XmlAbsent(name);
          }
          return children.get(0);
      }
docs: {@inheritDoc}
  
  @see nl.pvanassen.ns.xml.Xml#child(java.lang.String)