The screencast shows where a URI (with a fragment), in this case the introduction section of an article, can is cited. The user highlights and selects some text, enters the URI ( e.g., http://csarven.ca/dokieli#introduction
) and selects the type of citation (e.g., cite as information source). dokieli fetches the URI, grabs information like authors, title, year etc.. and enters that in the references section using the SPAR/CiTO relation (and schema:citation). There is a relation between the fragment that's selected and the URI it cites.