Re: URL semantics
Tim Berners-Lee <timbl@w3.org> Fri, 10 January 1997 16:56 UTC
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Date: Fri, 10 Jan 1997 11:02:32 -0500
To: "Gregory J. Woodhouse" <gjw@wnetc.com>, Daniel LaLiberte <liberte@ncsa.uiuc.edu>
From: Tim Berners-Lee <timbl@w3.org>
Subject: Re: URL semantics
Cc: Dave Lewis <drlewi1@srv.pacbell.com>, uri@bunyip.com
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At 05:45 pm 09-01-97 -0800, Gregory J. Woodhouse wrote: >Actually, it seems that the real issue here is whether resources are just >data objects or whether they also include network services such as Telnet, >SMTP and News. URLs in the mailto: and telnet: namespaces do not retrieve >data objects but do invoke services. URLs in the news: or nntp: namespaces >can have semantics of either type, depending on whether the namespace >specific string is a newsgroup name or a message ID. What is an object and what is a service? What is a television channel? It can be represented by a window on the screen. It is useful to be able to link to it. It has a time component. An email address is something you can only post to. But I am happy for an object to have a conceptual identity, some interaction with the outside world, and some way of being represented to a user (or program). So for example, I would like my mail reader to represent mailto:gjw@wnetc.com with any address book information I have about this email address, plus a list of all messages I have to/from it, plus the ability to drag and drop messages onto it. This doesn't mean that the representation I have will be the same as anyone else's, but that is the semantics of the object. It is still a very well defined object. An object does not have to support HTTP "GET" to be a URI. A gateway could of course provide a sort of GET along the lines above. What Netscape does is assume you want to POST to the object, and assume you want to post a new message. It's the best they could do for now, and it's more use than nothing. But it should not be taken as defining the effect of GET on a mailto: URL. A "service" is a resource. If you call resources objects, that would make it an object -- but if you expect objects to have a public accessible finite state that would make it not an object. Tim >gjw@wnetc.com / http://www.wnetc.com/home.html >If you're going to reinvent the wheel, at least try to come >to come up with a better one. > >
- Re: URL semantics Dave Lewis
- Re: URL semantics Larry Masinter
- Re: URL semantics Daniel LaLiberte
- Re: URL semantics Gregory J. Woodhouse
- Re: URL semantics Tim Berners-Lee
- Re: URL semantics Daniel LaLiberte
- Re: URL semantics Tim Berners-Lee
- Re: URL semantics Larry Masinter
- Re: URL semantics Fisher Mark
- Use Web to launch apps (was Re: URL semantics) Zheng Wang