1. The Rule key in getting problem summaries is based upon the ruleid and title only. If a single rule produces more than one thing with effort (for example, both a classification and a hint) it is possible for both to have the same title. That would cause the effort calculation to break.

2. The hint itself might be related to a remote schema that was loaded and this can cause it to attach to line numbers that are completely unrelated to the current file.

3. We really shouldn't treat failures in the parsing of third party schemas as a validation failure anyway. More times than not, this is just confusing to the user.