Github user tliron commented on a diff in the pull request:
https://github.com/apache/incubator-ariatosca/pull/207#discussion_r153344804
--- Diff: aria/parser/loading/uri.py ---
@@ -44,6 +45,7 @@ def __init__(self, context, location,
origin_location=None):
self.location = location
self._prefixes = StrictList(value_class=basestring)
self._loader = None
+ self._canonical_location = None
--- End diff --
I added documentation in `loader.py` (the base class).---
