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Ed Summers wrote:

>> II. Description: To nicely show which publication someone refers to.
> 
> I think this is right. I wonder, would you consider a potential use
> case for Description to also provide machine readable data for a
> resource when a standard identifier is not known?

There are lookup services to get a standard identifier when only some 
bibliographic data is known - mainly OpenURL. I have not investigated 
whether you can easily map CSL format to OpenURL or if you need to also 
embed the OpenURL as twitter annotation. However all lookup services 
that I know are either crapy or proprietary or both. This is not a 
technical issue but just based on a lack of data (hopefully to get 
better with more linked open data). Given enough open bibliographic data 
anyone can create a lookup service where you throw in some title, author 
and this stuff and get back an identified record. I think there also are 
some services called "library catalog" for this purpose.

Anyway this os nothing that can be solved with a bibliographic data 
format alone. Either you have a standard identifier or you have not. If 
you have not, you must rely on third party services that run independent 
of your bibliographic data.

> It would be interesting to explore what identifiers + csl (and other
> options) would look like in a twitter annotation if you had time to
> mock something up in a wiki somewhere :-)

I summarized my findings on CSL at

http://wiki.code4lib.org/index.php/Citation_Style_Language

and included some ideas of CSL and other data in twitter annotations. 
Feel free to modify!

Cheers
Jakob

-- 
Jakob Voß <[log in to unmask]>, skype: nichtich
Verbundzentrale des GBV (VZG) / Common Library Network
Platz der Goettinger Sieben 1, 37073 Göttingen, Germany
+49 (0)551 39-10242, http://www.gbv.de