docs: def _parse(self):
          """ Given self.resource, split information from the CTS API
  
          :return: None
          """
          self.response = self.resource
          self.resource = self.resource.xpath("//ti:passage/tei:TEI", namespaces=XPATH_NAMESPACES)[0]
  
          self._prev_id, self._next_id = _SharedMethod.prevnext(self.response)
  
          if not self.citation.is_set() and len(self.resource.xpath("//ti:citation", namespaces=XPATH_NAMESPACES)):
              self.citation = CtsCollection.XmlCtsCitation.ingest(
                  self.response,
                  xpath=".//ti:citation[not(ancestor::ti:citation)]"
              )