code: def to_triples(self, short_pred=True, properties=True):
          
          ts = []
          qs = set(self.nodeids(quantifier=True))
          for n in nodes(self):
              pred = n.pred.short_form() if short_pred else n.pred.string
              ts.append((n.nodeid, 'predicate', pred))
              if n.lnk is not None:
                  ts.append((n.nodeid, 'lnk', '"{}"'.format(str(n.lnk))))
              if n.carg is not None:
                  ts.append((n.nodeid, 'carg', '"{}"'.format(n.carg)))
              if properties and n.nodeid not in qs:
                  for key, value in n.sortinfo.items():
                      ts.append((n.nodeid, key.lower(), value))
  
          for l in links(self):
              if safe_int(l.start) == LTOP_NODEID:
                  ts.append((l.start, 'top', l.end))
              else:
                  relation = '{}-{}'.format(l.rargname.upper(), l.post)
                  ts.append((l.start, relation, l.end))
          return ts
docs: Encode the Dmrs as triples suitable for PENMAN serialization.