Updated Protocol draft available

Changes include especially clarity around 4.1.4 and added section 5 on
Error conditions.
Other minor tweaks and typo fixes.

http://w3c.github.io/web-annotation/protocol/wd/

Comments welcome as always and CFC to publish as FPWD coming soon

Rob

-- 
Rob Sanderson
Information Standards Advocate
Digital Library Systems and Services
Stanford, CA 94305