docs: private String selectTerm(String iri, List<String> containers, String typeLanguage,
              List<String> preferredValues) {
          final Map<String, Object> inv = getInverse();
          // 1)
          final Map<String, Object> containerMap = (Map<String, Object>) inv.get(iri);
          // 2)
          for (final String container : containers) {
              // 2.1)
              if (!containerMap.containsKey(container)) {
                  continue;
              }
              // 2.2)
              final Map<String, Object> typeLanguageMap = (Map<String, Object>) containerMap
                      .get(container);
              // 2.3)
              final Map<String, Object> valueMap = (Map<String, Object>) typeLanguageMap
                      .get(typeLanguage);
              // 2.4 )
              for (final String item : preferredValues) {
                  // 2.4.1
                  if (!valueMap.containsKey(item)) {
                      continue;
                  }
                  // 2.4.2
                  return (String) valueMap.get(item);
              }
          }
          // 3)
          return null;
      }