[imsc] Pull Request: Addresses #127 (Extensibility goals not documented)

palemieux has just submitted a new pull request for 
https://github.com/w3c/imsc:

== Addresses #127 (Extensibility goals not documented) ==
Closes #127

See https://github.com/w3c/imsc/pull/165

Received on Wednesday, 10 February 2016 00:47:14 UTC