/**
  * Get an instance by compound key
  *
  * This is a utility method to get a single instance with a given set of
  * key-value pairs. Usually used for the primary key for a compound key; thus
  * the name.
  *
  * @param array $kv array of key-value mappings
  *
  * @return get_called_class() object if found, or null for no hits
  *
  */
 static function pkeyGet(array $kv)
 {
     return parent::pkeyGetClass(get_called_class(), $kv);
 }
 static function pkeyGet($kv)
 {
     return Memcached_DataObject::pkeyGetClass('Status_network_tag', $kv);
 }