On Sat, 16 Aug 2008 08:38:26 +0200 Johansson Olle E <[EMAIL PROTECTED]> wrote:
> > 15 aug 2008 kl. 23.45 skrev Peter Saint-Andre: > > > Pavel Simerda wrote: > > > >> Btw, what I didn't know before... I have looked into the CID/MID > >> rfc and there's nothing about requiring the at-sign. It's only > >> written in the common practice sections but there they use. And > >> they do use local hstnames, not shared strings. > >> But then "xmpp.sha1.da39aee5e6b4b0d3255bfef95601890afd807099" (or > >> similar syntax) is just as conforming as any other syntax. > >> The interesting point of the RFC is that the CIDs must be globally > >> unique but it apparently leaves it for the implementors to be > >> clever enough not to have the same idea. > >> It depends if you want to break common practice. > > > > I don't think that's right. Looking at RFC 2111 we find: > > > > content-id = url-addr-spec > > > > and > > > > url-addr-spec = addr-spec ; URL encoding of RFC 822 addr-spec > > > > Then consulting RFC 822 we find: > > > > addr-spec = local-part "@" domain > > > > However, I think we don't have to use a UUID for the local-part, > > we could use a hash. > > > >> The hostname is just useless for the XMPP purposes. But if we keep > >> it for common practice, I'd suggest a constant one then (as it's > >> useless anyway). > > > > I don't see a use for it now, but that doesn't mean it's useless. > > However, I'm OK with hardcoding it to bob.xmpp.org or something. > > Using domain or host here is like the recommendation to use it as > part of the call ID or realm in SIP. Using your own domain > ensures a unique namespace for you. Using a hostname ensures a > unique namespace for your host. In both these cases, > it doesn't have any other meaning - it's never parsed or resolved. > It's just a way to ensure uniqueness in a simple way. Exactly. And this means the domain's owner is responsible for the uniqueness. But how can example.com owners be responsible for uniqueness of [EMAIL PROTECTED]'s own ids? If we specify a hashing approach, I would not use local domains in the CIDs just because we (xmpp.org) are who specified how to achieve the uniqueness. Pavel > /O -- Web: http://www.pavlix.net/ Jabber & Mail: pavlix(at)pavlix.net OpenID: pavlix.net
