List all the attributes to be rendered directly from some
        to-be-copied :class:`rtcclient.workitem.Workitem`

        :param copied_from: the to-be-copied
            :class:`rtcclient.workitem.Workitem` id
        :param keep: (default is False) If `True`, some of below parameters
            (which will not be included in some customized
            :class:`rtcclient.workitem.Workitem` type ) will remain
            unchangeable with the to-be-copied
            :class:`rtcclient.workitem.Workitem`.
            Otherwise for `False`.

                * teamArea (Team Area)
                * ownedBy (Owned By)
                * plannedFor(Planned For)
                * severity(Severity)
                * priority(Priority)
                * filedAgainst(Filed Against)
        :return: a :class:`set` contains all the needed attributes
        :rtype: set

def listFieldsFromWorkitem(self, copied_from, keep=False):
        """List all the attributes to be rendered directly from some
        to-be-copied :class:`rtcclient.workitem.Workitem`

        :param copied_from: the to-be-copied
            :class:`rtcclient.workitem.Workitem` id
        :param keep: (default is False) If `True`, some of below parameters
            (which will not be included in some customized
            :class:`rtcclient.workitem.Workitem` type ) will remain
            unchangeable with the to-be-copied
            :class:`rtcclient.workitem.Workitem`.
            Otherwise for `False`.

                * teamArea (Team Area)
                * ownedBy (Owned By)
                * plannedFor(Planned For)
                * severity(Severity)
                * priority(Priority)
                * filedAgainst(Filed Against)
        :return: a :class:`set` contains all the needed attributes
        :rtype: set
        """

        temp_source = self.getTemplate(copied_from,
                                       template_name=None,
                                       template_folder=None,
                                       keep=keep)
        return self.listFieldsFromSource(temp_source)