code: private String[] getAttributeGroupObjectInterfaces(List<String> parentsName) {
          return listToArray(parentsName.stream().map(XsdAsmUtils::firstToUpper).collect(Collectors.toList()), CUSTOM_ATTRIBUTE_GROUP);
      }
docs: Obtains an array with the names of the interfaces implemented by a attribute group interface
  with the given parents, as in interfaces that will be extended.
  @param parentsName The list of interfaces that this interface will extend.
  @return A {@link String} array containing the names of the interfaces that this interface will extend.