rem: break;
add: return 0;
context: int send_notify(struct presentity* _p, struct watcher* _w){	body.len = 0;	switch(_w->accept) {	case DOC_XPIDF:		return send_xpidf_notify(_p, _w);		break;	case DOC_LPIDF:		return send_lpidf_notify(_p, _w);		break;	case DOC_PIDF:		return send_pidf_notify(_p, _w);		break;	}	return -1;}