code: def _parse_tree(self, node):
          
          if 'date' in node.attrib:
              dt = dateutil.parser.parse(node.attrib['date'])
              self.date = int(dt.strftime("%s"))
          if 'id' in node.attrib:
              self.id = node.attrib['id']
          if 'karma' in node.attrib:
              self.karma = int(node.attrib['karma'])
          if 'score' in node.attrib:
              self.score = int(node.attrib['score'])
          if 'rating' in node.attrib:
              self.rating = int(node.attrib['rating'])
          for c3 in node:
              if c3.tag == 'lang':
                  self.locale = c3.text
              if c3.tag == 'version':
                  self.version = c3.text
              if c3.tag == 'reviewer_id':
                  self.reviewer_id = c3.text
              if c3.tag == 'reviewer_name':
                  self.reviewer_name = c3.text
              if c3.tag == 'summary':
                  self.summary = c3.text
              if c3.tag == 'description':
                  self.description = _parse_desc(c3)
              if c3.tag == 'metadata':
                  for c4 in c3:
                      if c4.tag == 'value':
                          if 'key' in c4.attrib:
                              self.metadata[c4.attrib['key']] = c4.text
docs: Parse a <review> object