code: private Set<SNode> getMatchedNodes(SDocumentGraph graph) {
  
      Set<SNode> matchedNodes = new HashSet<>();
  
      for (SNode node: graph.getNodes()) {
         if (node.getFeature(AnnisConstants.ANNIS_NS, AnnisConstants.FEAT_MATCHEDNODE) != null)
           matchedNodes.add(node);
      }
  
      return matchedNodes;
    }
docs: Takes a match and returns the matched nodes.
  
  @param graph
  
  @throws java.io.IOException