<html><head><base href="x-msg://9/"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">A dns URI should be able to, given proper profiling, unambiguously references a host (which in dns scheme terms, the example provided intimates a dns query for 'A' records). i think that is the closest existing counterpart to what you are trying to express here, where a host is likely to be profiled for use here as a set of IP addresses and/or CNAMEs.<div><br></div><div>Not sure it would be desirable to define a different concept of host, given the close similarity to the concept you are looking for and the intentions of the dns scheme. This may also give you some flexibility in describing host in the SMTP sense:</div><div><br></div><div>dns:example.org?type=MX</div><div><br></div><div>are there requirements which would allow the definition of a phantom host, one that does not exist in the DNS, but has meaning here?</div><div><br></div><div>=peterd</div><div><br><div><div>On Nov 9, 2009, at 11:06 AM, Eran Hammer-Lahav wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite"><span class="Apple-style-span" style="border-collapse: separate; font-family: Helvetica; font-size: medium; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; "><div lang="EN-US" link="blue" vlink="purple" style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><div class="Section1"><div style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 12pt; font-family: 'Times New Roman', serif; "><span style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125); ">Not really.<o:p></o:p></span></div><div style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 12pt; font-family: 'Times New Roman', serif; "><span style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125); "><o:p> </o:p></span></div><div style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 12pt; font-family: 'Times New Roman', serif; "><span style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125); ">DNS URIs are defined to be about the DNS *<b>records</b>* not about what the records point to or mean. It is a pointer into the DNS system. An XRD with a DNS URI subject would express information about that record such as who updated it and when, and potentially some security related properties. I don’t really see any value in such an XRD at this point (since DNS is a self containing data source), but that’s what such an XRD would mean semantically.<o:p></o:p></span></div><div style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 12pt; font-family: 'Times New Roman', serif; "><span style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125); "><o:p> </o:p></span></div><div style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 12pt; font-family: 'Times New Roman', serif; "><span style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125); ">EHL<o:p></o:p></span></div><div style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 12pt; font-family: 'Times New Roman', serif; "><span style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125); "><o:p> </o:p></span></div><div style="border-top-style: none; border-right-style: none; border-bottom-style: none; border-width: initial; border-color: initial; border-left-style: solid; border-left-color: blue; border-left-width: 1.5pt; padding-top: 0in; padding-right: 0in; padding-bottom: 0in; padding-left: 4pt; "><div><div style="border-right-style: none; border-bottom-style: none; border-left-style: none; border-width: initial; border-color: initial; border-top-style: solid; border-top-color: rgb(181, 196, 223); border-top-width: 1pt; padding-top: 3pt; padding-right: 0in; padding-bottom: 0in; padding-left: 0in; "><div style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 12pt; font-family: 'Times New Roman', serif; "><b><span style="font-size: 10pt; font-family: Tahoma, sans-serif; ">From:</span></b><span style="font-size: 10pt; font-family: Tahoma, sans-serif; "><span class="Apple-converted-space"> </span><a href="mailto:openid-general-bounces@lists.openid.net" style="color: blue; text-decoration: underline; ">openid-general-bounces@lists.openid.net</a><span class="Apple-converted-space"> </span>[mailto:openid-general-bounces@lists.openid.net]<span class="Apple-converted-space"> </span><b>On Behalf Of<span class="Apple-converted-space"> </span></b>Peter Davis<br><b>Sent:</b><span class="Apple-converted-space"> </span>Monday, November 09, 2009 5:28 AM<br><b>To:</b><span class="Apple-converted-space"> </span>John Panzer<br><b>Cc:</b><span class="Apple-converted-space"> </span><a href="mailto:openid-general@lists.openid.net" style="color: blue; text-decoration: underline; ">openid-general@lists.openid.net</a><br><b>Subject:</b><span class="Apple-converted-space"> </span>Re: [OpenID] host-meta and "acct:"<o:p></o:p></span></div></div></div><div style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 12pt; font-family: 'Times New Roman', serif; "><o:p> </o:p></div><div><div><div style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 12pt; font-family: 'Times New Roman', serif; ">On Nov 6, 2009, at 12:42 PM, John Panzer wrote:<o:p></o:p></div></div><div style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 12pt; font-family: 'Times New Roman', serif; "><br><br><o:p></o:p></div><div style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 12pt; font-family: 'Times New Roman', serif; "><span class="apple-style-span"><span style="font-size: 13.5pt; font-family: Helvetica, sans-serif; ">We have one compelling use case already where the existing <Subject> doesn't work: host-meta is "about" a host, and there is no URI scheme to represent Hosts (see IIW notes at <a href="https://docs.google.com/a/johnpanzer.com/Doc?docid=0AZojn6fzr_tFZGRqNjhzcXZfOWY1cXA3emY5&hl=en" style="color: blue; text-decoration: underline; ">https://docs.google.com/a/johnpanzer.com/Doc?docid=0AZojn6fzr_tFZGRqNjhzcXZfOWY1cXA3emY5&hl=en</a></span></span><span class="apple-converted-space"><span style="font-size: 13.5pt; font-family: Helvetica, sans-serif; "> </span></span><span class="apple-style-span"><span style="font-size: 13.5pt; font-family: Helvetica, sans-serif; ">for alternatives considered). The simplest thing that anyone can come up with for this use case that doesn't run into tripwires or pitfalls is a separate element, <hm:Host>, that contains a hostname.</span></span><o:p></o:p></div><div style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 12pt; font-family: 'Times New Roman', serif; "><o:p> </o:p></div></div><div><div style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 12pt; font-family: 'Times New Roman', serif; ">One possible alternative it to use the dns URI scheme (RFC4501), which, i think, for the purposes need here, would likely take the form:<o:p></o:p></div></div><div><div style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 12pt; font-family: 'Times New Roman', serif; "><o:p> </o:p></div></div><div><div style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 12pt; font-family: 'Times New Roman', serif; "><span class="apple-tab-span"> dns:www.example.org</span><o:p></o:p></div></div><div><div style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 12pt; font-family: 'Times New Roman', serif; "><o:p> </o:p></div></div><div><div style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 12pt; font-family: 'Times New Roman', serif; ">you can, of course, use other aspects which might be interesting for use cases with host-meta such as forming dns queries in the URI to a dns authority of a zone returning RR types, but i do not know use cases for that.<o:p></o:p></div></div><div><div style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 12pt; font-family: 'Times New Roman', serif; "><o:p> </o:p></div></div><div><div style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 12pt; font-family: 'Times New Roman', serif; ">=peterd<o:p></o:p></div></div><div><div style="margin-top: 0in; margin-right: 0in; margin-bottom: 0.0001pt; margin-left: 0in; font-size: 12pt; font-family: 'Times New Roman', serif; "><o:p> </o:p></div></div></div></div></div></span></blockquote></div><br><div>
<span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-size: medium; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; "><div>Peter Davis: Neustar, Inc.<br>Director & Distinguished Member of the Technical Staff<br>45980 Center Oak Plaza Sterling, VA 20166<br>[T] +1 571 434 5516 [E] <a href="mailto:peter.davis@neustar.biz">peter.davis@neustar.biz</a> [W]<br><a href="http://www.neustar.biz/">http://www.neustar.biz/</a> <br> [X] <a href="xri://@neustar*pdavis">xri://@neustar*pdavis</a> [X] <a href="xri://=peterd">xri://=peterd</a><br>The information contained in this e-mail message is intended only for <br>the use of the recipient(s) named above and may contain confidential <br>and/or privileged information. If you are not the intended recipient <br>you have received this e-mail message in error and any review, <br>dissemination, distribution, or copying of this message is strictly <br>prohibited. If you have received this communication in error, please <br>notify us immediately and delete the original message.<br></div></span>
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