code: protected void findCorrelatedNodes(CorrelationIdentifier cid, Set<Node> nodes) {
          if (isCorrelated(cid)) {
              nodes.add(this);
          }
      }
docs: This method identifies all of the nodes within a trace that
  are associated with the supplied correlation identifier.
  
  @param cid The correlation identifier
  @param nodes The set of nodes that are associated with the correlation identifier