This is a useful, though quite technical, paper discussing how to reuse common resources - like images and videos - that appear on academic and educational web pages. The core of the proposal is a 'resource map' that basically identifies an HTML page (known as the 'splash page') and the resources (like images, videos, etc.) linked or embedded in that page. These resource maps resemble the tables I would use in Edu_RSS when trying to identify 'conversations' between bloggers (and if I could simply use such a map produced by someone else, it would save me a lot of processing). What is significant is that these resources can be 'graphed' - that is, the links and connections between pages and resources creates an interlinked network of such resources that can be crawled by mechanized aggregators. See also