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 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? 
- 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. 
- 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 
 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
Mobile site:
Digital Library: