- From: Kingsley Idehen <kidehen@openlinksw.com>
- Date: Mon, 17 Jan 2011 11:08:37 -0500
- To: Martin Hepp <martin.hepp@ebusiness-unibw.org>
- CC: public-lod@w3.org
On 1/17/11 10:51 AM, Martin Hepp wrote: > Dear all: > > RFC 2616 [1, section 3.2.3] says that > > "When comparing two URIs to decide if they match or not, a client > SHOULD use a case-sensitive octet-by-octet comparison of the entire > URIs, with these exceptions: > > - A port that is empty or not given is equivalent to the default > port for that URI-reference; > - Comparisons of host names MUST be case-insensitive; > - Comparisons of scheme names MUST be case-insensitive; > - An empty abs_path is equivalent to an abs_path of "/". > > Characters other than those in the "reserved" and "unsafe" sets (see > RFC 2396 [42]) are equivalent to their ""%" HEX HEX" encoding. > > For example, the following three URIs are equivalent: > > http://abc.com:80/~smith/home.html > http://ABC.com/%7Esmith/home.html > http://ABC.com:/%7esmith/home.html > " > > Does this also hold for identifying RDF resources Yes, where an RDF resource is a Data Container at an Address (URL). Thus, equivalent results for de-referencing a URL en route to accessing data. No, when "resource" also implies an Entity (Data Item or Data Object) that is assigned a Name via URI. The examples above strike me as URLs. Of course, cURL could indicate otherwise, but for now (via my visual senses) they appear to be URLs (resource addresses). > > a) in theory and > b) in practice (e.g. in popular triplestores)? > > I did not test it yet, but I assume that not all implementations would > treat > > http://purl.org/NET/c4dm/event.owl#Event > HTTP://purl.org/NET/c4dm/event.owl#Event > http://PURL.org/NET/c4dm/event.owl#Event > http://purl.org:80/NET/c4dm/event.owl#Event > > as the same class. > > Any facts or opinions? See my comments above. Kingsley > > Best > > Martin > > > [1] http://www.ietf.org/rfc/rfc2616.txt > > -------------------------------------------------------- > martin hepp > e-business & web science research group > universitaet der bundeswehr muenchen > > e-mail: hepp@ebusiness-unibw.org > phone: +49-(0)89-6004-4217 > fax: +49-(0)89-6004-4620 > www: http://www.unibw.de/ebusiness/ (group) > http://www.heppnetz.de/ (personal) > skype: mfhepp > twitter: mfhepp > > > -- Regards, Kingsley Idehen President& CEO OpenLink Software Web: http://www.openlinksw.com Weblog: http://www.openlinksw.com/blog/~kidehen Twitter/Identi.ca: kidehen
Received on Monday, 17 January 2011 16:09:19 UTC