label/comment for state/style/scope

Taken from
http://www.openannotation.org/spec/core/20130205/specific.html
label/comment for multiplicity constructs

Based on:
http://www.openannotation.org/spec/core/20130205/multiplicity.html
label/comment for oa:equivalentTo

Based on
http://www.openannotation.org/spec/core/20130205/publishing.html
Final tweaks
Small tweaks on data types properties