::
        
            POST /:login/machines/:id/tags
        
        Appends the tags (expressed as arbitrary keyword arguments) to those 
        already set for the machine.

def add_tags(self, **kwargs):
        """
        ::
        
            POST /:login/machines/:id/tags
        
        Appends the tags (expressed as arbitrary keyword arguments) to those 
        already set for the machine.
        """
        j, _ = self.datacenter.request('POST', self.path + '/tags', 
            data=kwargs)
        return j