ObjXMPP  Diff

	XMPPDiscoIdentity *identity;
	of_comparison_result_t categoryResult;
	of_comparison_result_t typeResult;

	if (object == self)
		return OF_ORDERED_SAME;

	if (![(id)object isKindOfClass: [XMPPDiscoIdentity class]])
		@throw [OFInvalidArgumentException exception];

	identity = (XMPPDiscoIdentity *)object;

	categoryResult = [_category compare: identity->_category];
	if (categoryResult != OF_ORDERED_SAME)
		return categoryResult;