From the W3C Web Annotation spec that Hypothesis implements href="https://www.w3.org/TR/annotation-model/" rel="nofollow">https://www.w3.org/TR/annotation-model/ :
> Selectors: Fragment Selector, CSS Selector, XPath Selector, Text Quote Selector, Text Position Selector, Data Position Selector, SVG Selector, Range Selector, Refinement of Selection
> States: Time State, Request Header State, Refinement of State
href="https://github.com/hypothesis/h" rel="nofollow"https://github.com/hypothesis/h
href="https://github.com/hypothesis/client" rel="nofollow">https://github.com/hypothesis/client
Randall, the lead developer, is one of the authors of the open annotation spec: href="http://www.openannotation.org" rel="nofollow">http://www.openannotation.org
Dan, the founder, recently put together the I Annotate conference, which brought together all the individuals and groups who have been applying annotation to their problem domains for the past few years.
I designed the interface.
Annotation should be open source, standardized, and portable, not locked into little silos. Also, I'm not pg, but if I was, I would find this a bit... odd.