Madhyamakas and Ontological Categories

The status of categories within Madhyamaka philosophy is a curious one. On the one hand there is a strong tendency to reject philosophically refined analyses of the constituents which make up the world, thereby rejecting systems of categories as well. The Madhyamika, it seems, accepts whatever conventions the world accepts at the merely conventional level but does not propose any conventions of his own. In fact there appear to be good reasons for such a view. Given that the membership of an object in a category is generally taken to be a clear example of a property an object has intrinsically, and since the Madhyamikas reject intrinsic properties (properties which exist by svabhava) they should reject categories as well.