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I'll bite. There are actually a number of http URLs that work like http://dx.doi.org/10.1111/j.1475-4983.2007.00728.x One of them is http://doi.wiley.com/10.1111/j.1475-4983.2007.00728.x Another is run by crossref; Some OpenURL ink servers also have doi proxy capability. So for code to extract the doi reliably from http urls, the code needs to know all the possibilities for the doi proxy stem. The proxies also tend to have optional parameters that can control the resolution. In principle, the info:doi/ stem addresses this. On Apr 1, 2009, at 7:27 AM, Ross Singer wrote: > What I don't understand is the > reason to express that identifier as: > > info:doi/10.1111/j.1475-4983.2007.00728.x > > when > > http://dx.doi.org/10.1111/j.1475-4983.2007.00728.x > Eric Hellman [log in to unmask] (personal) http://hellman.net/eric/