<html><head></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><div><div>On Nov 6, 2009, at 12:42 PM, John Panzer 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; ">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">https://docs.google.com/a/johnpanzer.com/Doc?docid=0AZojn6fzr_tFZGRqNjhzcXZfOWY1cXA3emY5&hl=en</a><span class="Apple-converted-space"> </span>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><br class="Apple-interchange-newline"></blockquote><br></div><div>One possible alternative it to use the dns URI scheme (RFC4501), which, i think, for the purposes need here, would likely take the form:</div><div><br></div><div><span class="Apple-tab-span" style="white-space:pre"> dns:www.example.org</span></div><div><br></div><div>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.</div><div><br></div><div>=peterd</div><div><br></div></body></html>