code: def get_evidence(self, relation):
          provenance = relation.get('provenance')
          text = None
          context = None
          if provenance:
              sentence_tag = provenance[0].get('sentence')
              if sentence_tag and '@id' in sentence_tag:
                  sentence_id = sentence_tag['@id']
                  sentence = self.doc.sentences.get(sentence_id)
                  if sentence is not None:
                      text = _sanitize(sentence['text'])
                  timexes = sentence.get('timexes', [])
                  if timexes:
                      timex = timexes[0]
                      tc = time_context_from_timex(timex)
                      context = WorldContext(time=tc)
                  geolocs = sentence.get('geolocs', [])
                  if geolocs:
                      geoloc = geolocs[0]
                      rc = ref_context_from_geoloc(geoloc)
                      if context:
                          context.geo_location = rc
                      else:
                          context = WorldContext(geo_location=rc)
              doc_id = provenance[0].get('document', {}).get('@id')
              if doc_id:
                  title = self.doc.documents.get(doc_id, {}).get('title')
                  if title:
                      provenance[0]['document']['title'] = title
          annotations = {'found_by': relation.get('rule'),
                         'provenance': provenance}
          if self.doc.dct is not None:
              annotations['document_creation_time'] = self.doc.dct.to_json()
          epistemics = {}
          negations = self.get_negation(relation)
          hedgings = self.get_hedging(relation)
          if hedgings:
              epistemics['hedgings'] = hedgings
          if negations:
              epistemics['negated'] = True
              annotations['negated_texts'] = negations
          if text is None:
              text = _sanitize(event.get('text'))
          ev = Evidence(source_api='eidos', text=text, annotations=annotations,
                        context=context, epistemics=epistemics)
          return ev