func: constructor() public {
          
          
          _zer0netDb = Zer0netDbInterface(0xE865Fe1A1A3b342bF0E2fcB11fF4E3BCe58263af);
  
          
          bytes32 hash = keccak256(abi.encodePacked('aname.', _namespace));
  
          
          _predecessor = _zer0netDb.getAddress(hash);
  
          
          if (_predecessor != 0x0) {
              
              uint lastRevision = Nametag(_predecessor).getRevision();
              
              
              _revision = lastRevision + 1;
          }
      }