Hebrew Catholics should not be confused with Messianic Jews, who are members of independent Jewish Christian denominations, many of which are Sabbatarian Protestant, and like some Hebrew Catholics, some of their members also celebrate Jewish holy days and emphasize Jewish elements within Christianity. Hebrew Catholics are in full communion with the Bishop of Rome and are not an independent movement, and they may be either liberal or traditionalist. While some form of corporate ecclesial and ritual identity had been raised by some Hebrew Catholics prior to 2009, Pope Benedict XVI's Apostolic Constitution Anglicanorum Coetibus prompted suggestions that personal ordinariates could also be appropriate for other groups, such as Hebrew Catholics, who desire to preserve their identity within the Catholic Church.