>I said that a more robust system would require only the >specification of the DOI that would be used to retrieve automatically >all the metadata associated with the work (I understand that this is >possible, although I never tried it). Yes, it's true. Every DOI is a URL like http://dx.doi.org/10.123456/foo.bar. If you fetch it up normally it redirects you to the document, typically a page at the publisher with the abstract and a link to buy it, or in our case links to the RFC in various forms. If you fetch it and ask for "Accept: text/bibliography; style=bibtex" or application/json, you get the bibliographic data in bibtex or JSON. It's pretty handy. R's, John