- From: Uche Ogbuji <uche.ogbuji@fourthought.com>
- Date: Sun, 28 Apr 2002 09:57:23 -0600
- To: Mark Baker <distobj@acm.org>
- cc: www-rdf-interest@w3.org
> > But then I'm not sure why you mentioned that people should be using C-L in > > cases of shortcutting ".../" URIs to ".../index.html", rather than using > > redirection. Or did I misunderstand you? > > I'm not sure exactly what you mean by "shortcutting". It could mean one > of two things; > > 1. Equivalence > > When I want to communicate an equivalence relationship between two > resources, I use redirection. > > Here's an example that I used last year. This URI identifies my > definition of "brilliance"; > > http://www.markbaker.ca/2001/11/Brilliance/ > > It is a temporary redirect, which means that I reserve the right to > change my definition later. If I used a permanent redirect, I'm telling > the client that you can forget about my URI and just use the > dictionary.com one. > > 2. Delegation of representation > > In this case, a resource chooses to use another resource as its > representation, at least for that request. > > So there's definitely some similarities, but really, they're two > different mechanisms for solving different problems. OK. I think I'm mostly clear on things now. Thanks for walking me through this. And sorry to all for continuing this off-topic thread. It seems that the needs I'm pondering fall under "2. Delegation of representation". The 4Suite repository and Web server has containers, which are resources that are represented as simple XML documents that use XLinks to point to container children. Therefore the true representation of a 4Suite container, which is currently what you get if you do an HTTP request on the default HTTP listener is something like: <?xml version='1.0' encoding='UTF-8'?><ftss:Container xmlns:ftss='http://xmlns.4suite.org/reserved' xmlns:xlink='http://www.w3.org/19 99/xlink'> <ftss:Children> <ftss:ChildReference xlink:show='embed' xlink:actuate='onLoad' xlink:type='simple' xlink:href='uche.ogbuji.net;metadata'/> <ftss:ChildReference xlink:show='embed' xlink:actuate='onLoad' xlink:type='simple' xlink:href='images;metadata'/> <ftss:ChildReference xlink:show='embed' xlink:actuate='onLoad' xlink:type='simple' xlink:href='tech;metadata'/> <ftss:ChildReference xlink:show='embed' xlink:actuate='onLoad' xlink:type='simple' xlink:href='xhtml.docdef;metadata'/> <ftss:ChildReference xlink:show='embed' xlink:actuate='onLoad' xlink:type='simple' xlink:href='main.doc;metadata'/> <ftss:ChildReference xlink:show='embed' xlink:actuate='onLoad' xlink:type='simple' xlink:href='main.css;metadata'/> <ftss:ChildReference xlink:show='embed' xlink:actuate='onLoad' xlink:type='simple' xlink:href='publications.rdf;metadata'/> <ftss:ChildReference xlink:show='embed' xlink:actuate='onLoad' xlink:type='simple' xlink:href='presentations.rdf;metadata'/> <ftss:ChildReference xlink:show='embed' xlink:actuate='onLoad' xlink:type='simple' xlink:href='server-properties.xml;metadata'/> <ftss:ChildReference xlink:show='embed' xlink:actuate='onLoad' xlink:href='main.xslt;metadata' xlink:type='simple'/> </ftss:Children> </ftss:Container> This is the actual document resource represented by the 4Suite-hosted URL a) http://uche.ogbuji.net:8080/uche.ogbuji.net/ The problem is that I don't want people to get this when they surf to that resource. I want them to get my friendly HTML home page (for some definition of friendly :-) ). In particular, I want them to get the same thing as they would if they requested b) http://uche.ogbuji.net:8080/uche.ogbuji.net/main.doc?xslt=docbook.xslt Currently, 4Suite implements this as a temporary redirect. But you tied this usage to equivalence, which is not my intent here. I certainly don't think the container resource, which is the XML document shown above, is equivalent to the dynamically generated HTML generated from the main.doc resource in that container and the main.xslt stylesheet in that container. Rather, what I want is to delegate the representation of the container to this dynamic document, therefore your bullet item #2. But you were pretty terse in your presentation of that bullet item :-) What I've been trying to get at is that if redirection is not the way to do this, what is? And can I count on the proper support for whetever it is in user agents (we can fix/implement whatever is needed in the server ourselves). Beliewve me, I am *very* happy to get away from redirection for doing this, especially as redirection support between Mozilla, MSIE, Netscape and Opera is not consistent. Opera seems to have a serious bug with even basic temporary redirects, and MSIE seems to have a weird bug with double redurects (i.e. if you go to http://uche.ogbuji.net you are 302 redirected to URL (a) above, and then 302 redirected to URL (b) above, which seems to cause MSIE to corrupt its base URLs). A sample wget session: [uogbuji@borgia uogbuji]$ wget http://uche.ogbuji.net --09:51:37-- http://uche.ogbuji.net/ => `index.html' Connecting to uche.ogbuji.net:80... connected! HTTP request sent, awaiting response... 302 Found Location: http://uche.ogbuji.net:8080/uche.ogbuji.net/ [following] --09:51:37-- http://uche.ogbuji.net:8080/uche.ogbuji.net/ => `index.html' Connecting to uche.ogbuji.net:8080... connected! HTTP request sent, awaiting response... 302 Found Location: http://uche.ogbuji.net:8080/uche.ogbuji.net/main.doc?xslt=main.xslt [following] --09:51:37-- http://uche.ogbuji.net:8080/uche.ogbuji.net/main.doc?xslt=main.xs lt => `main.doc?xslt=main.xslt' Connecting to uche.ogbuji.net:8080... connected! HTTP request sent, awaiting response... 200 OK Length: 6,994 [text/html] 0K ...... 100% @ 9.46 KB/s 09:51:39 (9.45 KB/s) - `main.doc?xslt=main.xslt' saved [6994/6994] -- Uche Ogbuji Fourthought, Inc. uche.ogbuji@fourthought.com http://fourthought.com http://4Suite.org http://uche.ogbuji.net Track chair, XML/Web Services One (San Jose, Boston): http://www.xmlconference.com/ RDF Query using Versa - http://www-106.ibm.com/developerworks/xml/library/x-thi nk10/index.html WSDL and the Wild, Wild West - http://adtmag.com/article.asp?id=6004 XML, The Model Driven Architecture, and RDF @ XML Europe - http://www.xmleurope.com/2002/kttrack.asp#themodel
Received on Sunday, 28 April 2002 12:03:47 UTC