def query(self, query):
    '''Returns an iterable of objects matching criteria expressed in `query`.
       LoggingDatastore logs the access.
    '''
    self.logger.info('%s: query %s' % (self, query))
    return super(LoggingDatastore, self).query(query)
Returns an iterable of objects matching criteria expressed in `query`.
       LoggingDatastore logs the access.