def process_request(self, request):
        if request.META['CONTENT_TYPE'].lower() in 'application/xml':
            raise NotImplementedError
        
        return super(XMLMixin, self).process_request(request)
dataset/ETHPy150Open cootetom/ClassBasedGenericAPI/ClassBasedGenericAPI/mixins.py/XMLMixin.process_request/swapped operands of `in`