EDIT

import java.util.ArrayList;

import java.util.HashSet;

import java.util.List;

import java.util.Map;

import java.util.Map.Entry;

        return result;

    }

    @Override

    public UpdateResult saveCharacterNodeDtoList(List<CharacterNodeDto> dtos){

        MergeResult<TermNode> mergeResult;

        dtos.stream().forEach(dto -> nodeUuids.add(dto.getUuid()));

        List<TermNode> nodes = dao.list(nodeUuids, null, 0, null, null);

        //check all attributes for changes and adapt

        for (TermNode<Character> node: nodes){

            for (CharacterNodeDto dto: dtos){

    //            TermNodeDto dto = dtoIterator.next();

                        for (Representation rep: deleteRepresentations){

                            character.removeRepresentation(rep);

                        }

                    }

//                  structural modifier

                    if (!uuids.isEmpty()){

                        terms = termService.load(uuids, null);

                        Set<StatisticalMeasure> statisticalMeasures = new HashSet<>();

                            if (term instanceof StatisticalMeasure){

                                statisticalMeasures.add((StatisticalMeasure)term);

                            }

                    node.setTerm(character);

                    mergeResult = dao.merge(node, true);

                    result.addUpdatedObject(mergeResult.getMergedEntity());

                }

            }

        }

        return result;

    }