/**
   * Exports complex concept
   *
   * @param thesaurus
   * @param model
   * @return
   */
  public Model exportComplexConcept(Thesaurus thesaurus, Model model) {
    List<SplitNonPreferredTerm> complexConcepts =
        splitNonPreferredTermService.getSplitNonPreferredTermList(
            0, -1, thesaurus.getThesaurusId());
    if (!complexConcepts.isEmpty()) {

      for (SplitNonPreferredTerm complexConcept : complexConcepts) {

        Resource inScheme = model.createResource(complexConcept.getThesaurus().getIdentifier());

        // Add splitNonPreferredTerm resource
        Resource complexConceptRes =
            model.createResource(complexConcept.getIdentifier(), ISOTHES.SPLIT_NON_PREFERRED_TERM);

        model.add(complexConceptRes, SKOS.IN_SCHEME, inScheme);

        model.add(
            complexConceptRes,
            SKOSXL.LITERAL_FORM,
            StringEscapeUtils.unescapeXml(complexConcept.getLexicalValue()),
            complexConcept.getLanguage().getId());
        model.add(
            complexConceptRes,
            DCTerms.created,
            DateUtil.toISO8601String(complexConcept.getCreated()));
        model.add(
            complexConceptRes,
            DCTerms.modified,
            DateUtil.toISO8601String(complexConcept.getModified()));
        model.add(complexConceptRes, ISOTHES.STATUS, complexConcept.getStatus().toString());

        if (StringUtils.isNotEmpty(complexConcept.getSource())) {
          model.add(complexConceptRes, DC.source, complexConcept.getSource());
        }

        // Add compoundEquivalence resource

        Resource compoundEquivalenceRes = model.createResource(ISOTHES.COMPOUND_EQUIVALENCE);
        model.add(compoundEquivalenceRes, SKOS.IN_SCHEME, inScheme);
        model.add(compoundEquivalenceRes, ISOTHES.PLUS_UF, complexConcept.getIdentifier());
        for (ThesaurusTerm term : complexConcept.getPreferredTerms()) {
          model.add(compoundEquivalenceRes, ISOTHES.PLUS_USE, term.getIdentifier());
        }
      }
    }
    return model;
  }