<html><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">Hello,<div><br></div><div>I would like to clarify something about optional parameters: does an optional parameter have to appear, but without value, or does it have to be skipped completely, or are both options valid? </div><div><br></div><div>For instance, in authentication request, if I don't want to specify a claimed_id, do I simply not include the parameter in the list, or do I include it without value?</div><div><br></div><div>openid.ns=<a href="http://specs.openid.net/auth/2.0">http://specs.openid.net/auth/2.0</a><br></div><div>openid.mode=checkid_immediate<br>openid.claimed_id=<br>openid.assoc_handle=thisisahandle</div><div><br></div><div>vs</div><div><br></div><div>openid.ns=<a href="http://specs.openid.net/auth/2.0">http://specs.openid.net/auth/2.0</a><br>openid.mode=checkid_immediate<br>openid.assoc_handle=thisisahandle</div><div><br></div><div>Best regards</div><div><br></div><div>Jean-Noël Colin</div></body></html>