code: def _resolve_features(self):
          
  
          for parentid in self.featsbyparent:
              parent = self.featsbyid[parentid]
              for child in self.featsbyparent[parentid]:
                  parent.add_child(child, rangecheck=self.strict)
  
          # Replace top-level multi-feature reps with a pseudo-feature
          for n, record in enumerate(self.records):
              if not isinstance(record, Feature):
                  continue
              if not record.is_multi:
                  continue
              assert record.multi_rep == record
              newrep = sorted(record.siblings + [record])[0]
              if newrep != record:
                  for sib in sorted(record.siblings + [record]):
                      sib.multi_rep = newrep
                      if sib != newrep:
                          newrep.add_sibling(sib)
                  record.siblings = None
              parent = newrep.pseudoify()
              self.records[n] = parent
  
          if not self.assumesorted:
              for seqid in self.inferred_regions:
                  if seqid not in self.declared_regions:
                      seqrange = self.inferred_regions[seqid]
                      srstring = '##sequence-region {:s} {:d} {:d}'.format(
                          seqid, seqrange.start + 1, seqrange.end
                      )
                      seqregion = Directive(srstring)
                      self.records.append(seqregion)
  
          for record in sorted(self.records):
              yield record
          self._reset()
docs: Resolve Parent/ID relationships and yield all top-level features.