def METHOD_NAME(path, *args, **kwargs):
	try:
		print "opening", path
		dataset = vaex.METHOD_NAME(path, *args, **kwargs)
		if dataset is not None:
			if dataset.name not in dataset_map:
				dataset_map[dataset.name] = dataset
				dataset_list.append(dataset)
		return dataset
	except Exception, e:
		print >>sys.stderr, "error opening", path, e