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I attended Kevin Ford's presentation at SWIB12. Unfortunately the sound of the skype session was too bad to understand everything Kevin said. The recording http://3windmills.com/kefo-swib12-bfi/ is much better. After watching the recording I have a couple of questions about the Annotation core class. I already asked Kevin a couple of questions on twitter about this after the SWIB12 Skype session. Fro completeness I reproduce them here, as well as Kevin's answers. - Q: Annotation: isn't it just "relationships"? Why need extra entity? (http://twitter.com/lukask/status/273749651759439873) - A: Annotation can associate two Works (or Instances) not controlled by the agent creating the Annotation. Provides buffer area. Still, you raise a good question. We've debated this a number of times. - Q: can Annotations be used a) to flexibly extend the model? b) for adding provenance data? Etc. (http://twitter.com/lukask/status/273749990894092288) - A: We're wondering about "b," but we've not done any work on it. I think "a" is quite possible, and I've wondered the same. Now, in the presentation Annotations are called "assertions about the other core class elements", holding all kinds of possible additional information (reviews, holdings, book cover images, administrative data, etc.). It is also said: "annotations are additional assertions". There are a couple of examples from which you can see that an Annotation has at least three possible relations: "annotates" (one of the core classes), "target", which points at some external(?) entity (like the book cover, or an article), and an unnamed relation that identifies the "Annotation Agent". Besides that each Annotation probably has a Title or Name property, and hopefully a Timestamp property (to be able to define provenance). From the examples given I can't exactly figure out what the meaning of Annotation Agent is. It could be provenance information: the NYPL asserts that the NYTimes article is in fact a review about the bibframe work. Or it identifies that the NYPL publishes information that there is a review about the work in the NYTimes that might be of interest to the NYPL patrons. Then, the nature of the "target" relation. Does the target point to a BIBFRAME metadata representation of the NYTimes article (containing a URI to the actual article), or directly to the NYTimes article, or can it be both? Then: there are two reviews, one annotation points to a bibframe:work (NYTimes article), the other to a bibframe:instance (WashingtonPost article). What is the difference? Shouldn't it both be just Work or Instance? Not sure if a newspaper article should be a Work or an Instance. Lukas Koster Library Systems Coordinator Library and Information Systems Department Library of the University of Amsterdam Web: http://uba.uva.nl Mobile site: http://m.uba.uva.nl Digital Library: http://lib.uva.nl