code: def rename_xmlids(cr, xmlids_spec):
      
      for (old, new) in xmlids_spec:
          if '.' not in old or '.' not in new:
              logger.error(
                  'Cannot rename XMLID %s to %s: need the module '
                  'reference to be specified in the IDs' % (old, new))
          else:
              query = ("UPDATE ir_model_data SET module = %s, name = %s "
                       "WHERE module = %s and name = %s")
              logged_query(cr, query, tuple(new.split('.') + old.split('.')))
docs: Rename XML IDs. Typically called in the pre script.
      One usage example is when an ID changes module. In OpenERP 6 for example,
      a number of res_groups IDs moved to module base from other modules (
      although they were still being defined in their respective module).
  
      :param xmlids_spec: a list of tuples (old module.xmlid, new module.xmlid).