- From: Graham Klyne <GK@ninebynine.org>
- Date: Fri, 26 Mar 2004 09:38:06 +0000
- To: "Roy T. Fielding" <fielding@gbiv.com>
- Cc: uri@w3.org
At 18:51 25/03/04 -0800, Roy T. Fielding wrote: >On Tuesday, February 17, 2004, at 04:01 AM, Ray Merkert wrote: >>I was just in the middle of looking at IRIs, when I noticed something >>strange. It seems the >>URI 'http://w3c.org:80path1/path2' has become a valid URI, at least >>according to the >>collected BNF grammar in draft-fielding-uri-rfc2396bis-04.txt. > >I have tried various ways of explaining it in the text and finally >went back to multiple definitions of path, though I hope I've done >a better job of disambiguating the different cases than I did for >2396. I would appreciate it if the grammar-driven parsing experts >could have a look at > > http://gbiv.com/protocols/uri/rev-2002/rfc2396bis.html (or .xml) > >and see if the new ABNF rules work (I've already tested them with >the abnf.c tool). I'll try this out when I have some time... it may be a week or so. meanwhile, a quick point of confirmation concerning: [[ If a URI contains an authority component, then the path component must either be empty or begin with a slash ("/") character. If a URI does not contain an authority component, then the path cannot begin with two slash characters ("//"). In addition, a URI reference (Section 4.1) may begin with a relative path, in which case the first path segment cannot contain a colon (":") character. The ABNF requires five separate rules to disambiguate these cases, only one of which will match a given URI reference. We use the generic term "path component" to describe the URI substring that is matched by the parser to one of these rules. ]] This suggests to me that the minimal authority "//" is distinct from having no authority at all, which I think is fine. In particular, I think the above text means that it is not OK to remove a minimal "//" authority from a URI. (I always believed this to be the case, but I have encountered software that does remove "blank" authorities.) #g ------------ Graham Klyne For email: http://www.ninebynine.org/#Contact
Received on Friday, 26 March 2004 05:14:03 UTC