public void reset() {
   if (parentRoughArtifact != null) {
     parentRoughArtifact.clear();
   }
   roughArtifacts.clear();
   roughRelations.clear();
 }
 public void addChildRoughArtifact(RoughArtifact roughArtifact) {
   parentRoughArtifact.addChild(roughArtifact);
   addRoughArtifact(roughArtifact);
 }