Message-Id: <36C29A39.F6A4FEB2@natlab.research.philips.com> Date: Thu, 11 Feb 1999 09:52:09 +0100 From: Warner ten Kate <firstname.lastname@example.org> To: "Michael A. Dolan" <email@example.com> Cc: firstname.lastname@example.org Subject: Re: about tv: Mike, I am afraid I disagree. Michael A. Dolan wrote: > > 1. Noone will argue that tv: is a great URL. That's to say, here I agree ;-) > However it is a good URN. It isn't in my association of "good": a URN is supposed to be a persistent resource identifier. "current TV channel" is rather context dependent, so not persistent. > 2. There isn't a scheme proposed yet (that I have seen) that addresses the > multiple tuner issue. At least the dvb: scheme addresses that issue, namely by abstracting from that. The scheme identifies a resource, that's independent of the number of tuners your device contains. > > 3. Given the constraints of OBJECT and IMG and other places one wishes to > apply the semantics of placing video/audio into a web page, I see little > other mechanism than a URI to do it. Agree. > 4. If a URI is appropriate for (3), then how does one put "currently tuned > channel" onto a web page, if not with something like "tv:"? So, that's the requirement. I'll check our requirements doc on that and update accordingly. You assume there is other information available containing the "currently tuned to" (that information has probably caused the tuning). I don't have the proper solution, but I think we should look whether relative URLs are of use here. Something along the lines that the base-URL sets the context: the currently tuned TV-channel and its associated HTML pages (I mean the pages which are transmitted along with the video). The TV-channel is at the root defined by that base URL, so a reference like src="tv" could do, without colon suffix. The colon will conflict with the relative URL parsing rules. "tv" is the 'file' name of the video stream located at the root - probably names like src="video" and src="lang-en" are more useful. I am not sure whether we can specify default names here (with default semantics). Having just src="tv:" in a HTML page provides the author any guarantee the tv stream is displayed he had in mind. It is a scheme which works fine within a constrained environment like a single analog TV channel with VBI data transmission. There are not much alternatives there. Warner.