# self.type\r
# self.path\r
# provide either urn, or (hrn + type)\r
- def __init__ (self, xrn, type=None, id=None):\r
+ def __init__ (self, xrn="", type=None, id=None):\r
if not xrn: xrn = ""\r
# user has specified xrn : guess if urn or hrn\r
self.id = id\r