I've updated the sample Scheme implementation to use the new BNF production after ".".  It passes all the tests and seems to work well.  So I think we should use the updated BNF, with the new "post_period" production, so that we can cleanly handle special comments after ".".

I haven't heard anyone speak up about the utility of the ". $" construct, so I intend to remove it from the BNF and sample implementation unless someone speaks up ASAP.

After that, I plan to post an updated SRFI-110.

 --- David A. Wheeler