code: def process_associations(self, limit):
          
  
          myfile = '/'.join((self.rawdir, self.files['data']['file']))
          f = gzip.open(myfile, 'rb')
          filereader = io.TextIOWrapper(f, newline="")
          filereader.readline()  # remove the xml declaration line
          for event, elem in ET.iterparse(filereader):  # iterparse is not deprecated
              self.process_xml_table(
                  elem, 'Article_Breed', self._process_article_breed_row, limit)
              self.process_xml_table(
                  elem, 'Article_Phene', self._process_article_phene_row, limit)
              self.process_xml_table(
                  elem, 'Breed_Phene', self._process_breed_phene_row, limit)
              self.process_xml_table(
                  elem, 'Lida_Links', self._process_lida_links_row, limit)
              self.process_xml_table(
                  elem, 'Phene_Gene', self._process_phene_gene_row, limit)
              self.process_xml_table(
                  elem, 'Group_MPO', self._process_group_mpo_row, limit)
          f.close()
          return
docs: Loop through the xml file and process the article-breed, article-phene,
          breed-phene, phene-gene associations, and the external links to LIDA.
  
          :param limit:
          :return: