code: def index_data_relations(self):
          '''Standard Fedora relations to be included in
          :meth:`index_data` output.  This implementation includes all
          standard relations included in the Fedora relations namespace,
          but should be extended or overridden as appropriate for custom
          :class:`~eulfedora.models.DigitalObject` classes.'''
          data = {}
          # NOTE: hasModel relation is handled with top-level object properties above
          # currently not indexing other model rels (service bindings)
          for rel in fedora_rels:
              values = []
              for o in self.rels_ext.content.objects(self.uriref, relsextns[rel]):
                  values.append(force_text(o))
              if values:
                  data[rel] = values
          return datf index_data_relations(self):
          '''Standard Fedora relations to be included in
          :meth:`index_data` output.  This implementation includes all
          standard relations included in the Fedora relations namespace,
          but should be extended or overridden as appropriate for custom
          :class:`~eulfedora.models.DigitalObject` classes.'''
          data = {}
          # NOTE: hasModel relation is handled with top-level object properties above
          # currently not indexing other model rels (service bindings)
          for rel in fedora_rels:
              values = []
              for o in self.rels_ext.content.objects(self.uriref, relsextns[rel]):
                  values.append(force_text(o))
              if values:
                  data[rel] = values
          return data
docs: Standard Fedora relations to be included in
          :meth:`index_data` output.  This implementation includes all
          standard relations included in the Fedora relations namespace,
          but should be extended or overridden as appropriate for custom
          :class:`~eulfedora.models.DigitalObject` classes.