code: public KeePassFile enrichNodesWithReferences(KeePassFile keePassFile) {
          GroupZipper zipper = new GroupZipper(keePassFile);
          Iterator<Group> iter = zipper.iterator();
  
          while (iter.hasNext()) {
              Group group = iter.next();
  
              enrichEntriesWithReferences(group, keePassFile);
          }
  
          return zipper.close();
      }
docs: Iterates through all nodes of the given KeePass file and replace the nodes with enriched attachment data nodes.
  
  @param keePassFile the KeePass file which should be iterated
  @return an enriched KeePass file