233     def register(self, obj, registryname=None, oid=None, clear=False):

   233     def register(self, obj, registryname=None, oid=None, clear=False):

   234         """base method to add an object in the registry"""

   234         """base method to add an object in the registry"""

   235         assert not '__abstract__' in obj.__dict__

   235         assert not '__abstract__' in obj.__dict__

   236         registryname = registryname or obj.__registry__

   236         registryname = registryname or obj.__registry__

   237         oid = oid or obj.id

   237         oid = oid or obj.id

   238         registry = self._registries.setdefault(registryname, {})

   239         registry = self._registries.setdefault(registryname, {})

   239         if clear:

   240         if clear:

   240             vobjects = registry[oid] =  []

   241             vobjects = registry[oid] =  []

   241         else:

   242         else:

   242             vobjects = registry.setdefault(oid, [])

   243             vobjects = registry.setdefault(oid, [])