[web-annotation] Explain extending spec with new classes, esp Selectors

azaroth42 has just created a new issue for 
https://github.com/w3c/web-annotation:

== Explain extending spec with new classes, esp Selectors ==

In the Extensions section of the `vocab` document, we should add a 
section explaining that you can also create new classes, especially 
for Selectors and States.

Raised by @iherman, as this is just editorial, and chairs, staff 
contacts + editors agree, assigning it straight to editor_action.

Please view or discuss this issue at 
https://github.com/w3c/web-annotation/issues/234 using your GitHub 
account

Received on Thursday, 19 May 2016 15:54:19 UTC