code: public Classification codeOf(String classificationName, String code) {
          assertArgumentNotNull("elementName", classificationName);
          assertArgumentNotNull("code", code);
          return findClassificationMeta(classificationName, () -> {
              return "codeOf('" + classificationName + "', '" + code + "')";
          }).codeOf(code);
      }
docs: Get classification by code.
  @param classificationName The name of classification. (NotNull)
  @param code The code of classification to find. (NotNull)
  @return The found instance of classification for the code. (NotNull: if not found, throws exception)