- From: Henry S. Thompson <ht@inf.ed.ac.uk>
- Date: Mon, 23 Jun 2014 18:33:02 +0100
- To: David Singer <singer@apple.com>
- Cc: Robin Berjon <robin@w3.org>, Silvia Pfieffer <silviapfeiffer1@gmail.com>, TAG List <www-tag@w3.org>
David Singer writes: > On Jun 23, 2014, at 10:06 , Henry S. Thompson <ht@inf.ed.ac.uk> wrote: > >> David Singer writes: >> >>> Since we want permanent labels, I fear that tying them to a version >>> of the spec and its anchors and/or sections, and location, might be >>> fragile. And, as Robin points out, we don¢t need choice. >> >> The whole point of W3C's usage of undated URIs is so that the location >> _doesn't_ change. As long as there is a W3C, >> http://www.w3.org/TR/html5/#attr-trace-kind-subtitles will resolve. >> That's as good a promise as you're going to get (persistence as >> commonly understood is a service-level guarantee, _not_ a property of >> names!). > > and when HTML5 moves to HTML6 or 7? Is the name really specific to this version of HTML? > > what if some editor decides to change the name of the anchor (consistently in the document), so now it¢s > > http://www.w3.org/TR/html5/#attribute-trace-kind-subtitles > > is there really a guarantee of stability for anchor names? Either DASH want a guarantee of reference to what was meant on the day HTML5 does to REC, in which case they _do_ use a dated reference, or they want it to update as that spec evolves, in which case they use the undated one and depend on a commitment of preservation for the anchor from the HTML WG. If DASH doesn't want to depend on such a commitment, then they should go back to the namespace URI proposal, with a namespace document at http://www.w3.org/ns/html-track-kind with appropriate anchors in it, which _is_ under the control of DASH and can refer to whatever HTMLn document they choose to, updating as and when they choose to. I.e the 'http://www.w3.org/ns' namespace has the ability to deliver not only a _binding_ of various names, accompanied by an explicit policy regarding their mutabilty (see The Disposition of Names in an XML Namespace [1]), all of which is under the control of DASH, but also a _resolution_ mechanism for those names which DASH can adapt as necessary to accommodate to changes outside their control. ht [1] http://www.w3.org/2001/tag/doc/namespaceState.html -- Henry S. Thompson, School of Informatics, University of Edinburgh 10 Crichton Street, Edinburgh EH8 9AB, SCOTLAND -- (44) 131 650-4440 Fax: (44) 131 650-4587, e-mail: ht@inf.ed.ac.uk URL: http://www.ltg.ed.ac.uk/~ht/ [mail from me _always_ has a .sig like this -- mail without it is forged spam]
Received on Monday, 23 June 2014 17:33:28 UTC