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- --------- Received message begins Here ---------
-
- In response to:
-
- > From sanders@bsdi.com Thu May 27 15:33:24 1993
- > Subject: Re: Keeping HTML Simple & Format negotiation between Browser & Server
- > In-Reply-To: Your message of Thu, 27 May 93 14:24:29 CDT.
- > Organization: Berkeley Software Design, Inc.
- > Date: Thu, 27 May 1993 15:08:29 -0500
- > From: Tony Sanders <sanders@bsdi.com>
- >
- > My prefered scheme for selection of links in external objects is just send
- > the x,y coordinates of the selection to the server and let it deal with
- > it however is best. This is how the current selection stuff works for
- > <IMG ISMAP>. This lets you backend with whatever you need (like maybe
- > WAIS spatial indexing) without hardcoding anything in the client.
- >
- > This scheme has the advantages of being easy on the browser, simple to
- > implement, low network overhead, it fits in with the existing HTTP
- > protocol (even HTTP/0.9) and it's working today:
-
- It's easy on the browser, but devilishly difficult on the server. With a
- list of bounding rectangles for a link, it is possible for the links to be
- saved in a static file along with the document they apply to, without any need
- for an active process to mediate the clicks. This way, hyperlinked images can
- be stored on, e.g., ftp servers, or cached locally.
-
- In addition, with the bounding rectangles associated with a particular link,
- the browser doesn't need to contact the server to follow a link, and it becomes
- possible for the browser to provide feedback when the pointer is moved onto a link.
-
- A list of bounding rectangles need not be onerous on the network, particularly in
- comparison to the size of the images to begin with.
-
- > The same scheme could work for any external format with a little
- > cooperation from the viewer.
-
- Ditto the bounding rectangles scheme.
-
- A generic point and click scheme could be significantly better for things like
- mathematical graphing systems, where the server can do a reverse map of the click
- to a point in some transformed space. This could be a good thing.
-
- Perhaps we could have both systems?
-
- Jonathan Abbey
- Applied Research Laboratories
- University of Texas, Austin
-
-