code: def addTaxonToFeature(self, taxonid):
          
          self.taxon = taxonid
          self.graph.addTriple(self.fid, self.globaltt['in taxon'], self.taxon)
  
          return
docs: Given the taxon id, this will add the following triple:
          feature in_taxon taxonid
          :param graph:
          :param taxonid:
          :return: