code: protected JournalException getNotNextMemberOrEndOfGroupException(QName groupTagName,
                                                                       QName memberTagName,
                                                                       XMLEvent event) {
          return new JournalException("Expecting either '" + memberTagName
                  + "' start tag, or '" + groupTagName
                  + "' end tag, but event was '" + event + "'");
      }
docs: While traversing a group of member tags, we expected either the start of
  another member tag, or the end of the group.