code: def replace(self, name, *args):
          
  
          self._add(True, self.authority, name, *args)
docs: Replace records.  The first argument is always a name.  The other
          arguments can be:
  
                  - rdataset...
  
                  - ttl, rdata...
  
                  - ttl, rdtype, string...
  
          Note that if you want to replace the entire node, you should do
          a delete of the name followed by one or more calls to add.