def export(self, view_datas):
        """export view datas to registered exporters"""
        view_datas_copy = \
            [self.copy_and_finalize_view_data(vd) for vd in view_datas]
        if len(self.exporters) > 0:
            for e in self.exporters:
                try:
                    e.export(view_datas_copy)
                except AttributeError:
                    pass
export view datas to registered exporters