code: def get_features(self):
          
          l = self.xpath_ctxt.xpathEval("d:feature")
          ret = []
          for f in l:
              if f.hasProp("var"):
                  ret.append( f.prop("var").decode("utf-8") )
          return ret
docs: Get the features contained in `self`.
  
          :return: the list of features.
          :returntype: `list` of `unicode`