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    copied!<p>Here on Stack Overflow, we're just using the <a href="http://openid.net/specs/openid-simple-registration-extension-1_0.html" rel="noreferrer">Simple Registration</a> extension for now, as there were some issues with Attribute Exchange (AX).</p> <p>The biggest was OpenID Providers (OP) not agreeing on which <a href="http://www.axschema.org/types/" rel="noreferrer">attribute type urls</a> to use. The finalized spec for AX says that attribute urls should come from <a href="http://www.axschema.org/" rel="noreferrer">http://www.axschema.org/</a> However, some OPs, especially our favorite <a href="http://myopenid.com" rel="noreferrer">http://myopenid.com</a>, recognize <a href="http://openid.net/pipermail/general/2008-February/004158.html" rel="noreferrer">other</a> <a href="http://rakuto.blogspot.com/2008/03/ruby-fetch-some-attributes-from.html" rel="noreferrer">urls</a>. I wasn't going to keep a list of which ones were naughty and which were nice!</p> <p>The other problem was that most of the OPs I tried just didn't return information when queried with AX - I might have been doing something wrong (happens quite frequently :) ), but I had made relevant details public on my profiles and we're using the latest, most excellent .NET library, <a href="http://code.google.com/p/dotnetopenid/" rel="noreferrer">DotNetOpenId</a>.</p> <p>We'll definitely revisit AX here on Stack Overflow when we get a little more time, as a seamless user experience is very important to us!</p>
 

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