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<div>That's interesting, Ben, and I'd like to hear your comments once you guys use it a bit and get some feedback from applications as well.</div><div><br></div><div>We've used this form of pseudonym for five years now, originally calling it eduPersonTargetedID. We've had a lot of success with it once explaining to the application how it works. The interested RP's are those that want to maintain a set of preferences or customization for a unique user, or sites that want to guarantee that each user can only do something once. They're both forms of account linking. Nobody uses it as a primary identifier for display or "people picking", selecting an individual from a list.</div><div><br></div><div>It doesn't work for many applications, and it takes some discussion or analysis of each to understand what it's best to send to each. Yahoo can send different identifiers as well with their implementation, but it depends on user knowledge and expertise, not side admin configuration, which will probably make it a lot harder in practice. Your release of email address as an attribute may help here if RP's can train themselves to use that.</div><div><br></div><div>Take care,</div><div>Nate.</div><div><br></div><div><blockquote type="cite"><blockquote type="cite"><p style="margin: 0.0px 0.0px 0.0px 10.0px"><font face="Helvetica" size="3" style="font: 12.0px Helvetica">Separately, persistent opaque identifiers are a really good thing,</font></p> <p style="margin: 0.0px 0.0px 0.0px 10.0px"><font face="Helvetica" size="3" style="font: 12.0px Helvetica">especially when unique to a particular RP/SP.<span class="Apple-converted-space"> </span>When Yahoo first made the</font></p> <p style="margin: 0.0px 0.0px 0.0px 10.0px"><font face="Helvetica" size="3" style="font: 12.0px Helvetica">decision to use them as the default in their implementation, I was worried</font></p> <p style="margin: 0.0px 0.0px 0.0px 10.0px"><font face="Helvetica" size="3" style="font: 12.0px Helvetica">that most of their applications, users, and developers would be baffled, and</font></p> <p style="margin: 0.0px 0.0px 0.0px 10.0px"><font face="Helvetica" size="3" style="font: 12.0px Helvetica">didn't know why they weren't targeted.<span class="Apple-converted-space"> </span>I wonder if Allen has any new words</font></p> <p style="margin: 0.0px 0.0px 0.0px 10.0px"><font face="Helvetica" size="3" style="font: 12.0px Helvetica">of wisdom to share now that he has experience with them in practice.</font></p> </blockquote><p style="margin: 0.0px 0.0px 0.0px 0.0px; font: 12.0px Helvetica; min-height: 14.0px"><br></p> <p style="margin: 0.0px 0.0px 0.0px 0.0px"><font face="Helvetica" size="3" style="font: 12.0px Helvetica">I should point out that Google also use them.</font></p> </blockquote></div><br></body></html>