[dxwg] new commits pushed by dr-shorthair

The following commits were just pushed by dr-shorthair to https://github.com/w3c/dxwg:

* Make `Representation` abstract
  by Simon Cox
https://github.com/w3c/dxwg/commit/0a50f140b87ed3c26cba5fc6e828c880768461d1

Received on Friday, 31 August 2018 05:57:06 UTC