code: public void print(IncidentStream is, int actualDepth) {
          for (IntrospectionLevelMember ilm : _members) {
              ilm.print(is, actualDepth);
          }
      }
docs: Prints all the level members (note: the behavior is only well defined if
  called from a root IntrospectionLevel
  
  @param is
  The incidentStream on which to print
  @param actualDepth
  The actual depth to introspect down to.