- From: Pierre-Antoine Champin <pierre-antoine.champin@liris.cnrs.fr>
- Date: Tue, 25 Sep 2012 22:26:04 +0200
- To: Joakim Söderberg <joakim.soderberg@ericsson.com>
- Cc: Florian Stegmaier <stegmaier@dimis.fmi.uni-passau.de>, "public-media-annotation@w3.org" <public-media-annotation@w3.org>
- Message-ID: <CA+OuRR9Xy-DYai8hGhNABLuvv2rM4QNupjx0DkNT9qas=3x67g@mail.gmail.com>
I should be available as well. pa On Tue, Sep 25, 2012 at 10:21 PM, Joakim Söderberg < joakim.soderberg@ericsson.com> wrote: > Agreed, I am available next Tuesday. How about Daniel and Thierry? > > > > On 25 Sep 2012, at 16:57, Florian Stegmaier wrote: > > Dear all, > > due to this comments of TBL, we should immediately schedule a teleconf. > Those comments clearly address two major issues: > > 1) there is a need to rephrase our definitions of client- and server-side, > since they are misleading / not clear enough. > 2) we need to work on implementation. Here, a intermediate prototype could > serve as the "missing link" and maybe also underline our understanding of > client as well as server side. > > Unfortunately, i have no resources in near future to work on 2. Any > comments on this issues? > > Best, > Florian > _____________________________ > Dipl. Inf. Florian Stegmaier > Chair of Distributed Information Systems > University of Passau > Innstr. 43 > 94032 Passau > > Room 248 ITZ > > Tel.: +49 851 509 3063 > Fax: +49 851 509 3062 > > http://twitter.com/fstegmai > http://www.mendeley.com/profiles/florian-stegmaier/ > _____________________________ > > Anfang der weitergeleiteten Nachricht: > > *Umgeleitet von: *public-media-annotation@w3.org > *Von: *Tim Berners-Lee <timbl@w3.org> > *Betreff: **Separate features or not? API for Media Resources 1.0* > *Datum: *25. September 2012 16:11:48 MESZ > *An: *Joakim Söderberg <joakim.soderberg@ericsson.com> > *Kopie: *public-media-annotation@w3.org <public-media-annotation@w3.org>, > TAG List <www-tag@w3.org> > > > I'm Ccing www-tag as there is a general question about what > people mean by features and what we should aim for in terms > of interop. > > The question in debate is whether Media Resources is ready to > come out of CR, without two implementations of each version > of its API, sync and async. > > From: Joakim Söderberg <joakim.soderberg@ericsson.com> > > To: Philippe Le Hegaret <plh@w3.org> > > Cc: public-media-annotation@w3.org <public-media-annotation@w3.org> > > Subject: API for Media Resources 1.0 > > Date: Mon, 27 Aug 2012 12:52:32 +0200 > > > Dear Philippe, > > Here is the WG response to your questions. > > > a) Availability of the code: > > All implementations are open source projects. LMF is hosted at Github, the > > browser extension can be downloaded at the prototype page (the dpi includes > > the source files and can be extracted similar to a ZIP file). The third > > implementation (web service) can be downloaded at source forge. > > > > b) Usage of the API > > Find included two papers that explain the implementations. They should give > > the needed details for the browser extension and the server side > > implementation. The code pieces of the API will soon be available in the > LMF > > branch at Github (maybe with the next major release). Currently it can be > > found here: > > > > https://svn.salzburgresearch.at/svn/lmf-media/ > > > > This project needs the complete LMF as dependency. That´s why it seems to > be > > a little bit "tiny". > > > > c) number of implementations > > This was discussed, that we do not see the sync and the async mode as > > separate features. > > > Let me understand what your mean by that. > > You can't have your cake and eat it. > If they are not separate features, then every implementation implements > both. > A client can chose which or a combination of them which it uses, and works > in either case. > > If servers sometimes implement one without the other, then of course > interop is much reduced. (Unless every client is written to work with > either). > You have really two smaller specs which may > or may not be each implemented by various servers. > You have to effectively show that each spec contributes usefully > to the interop in the world, and the typical way is to show at least two > interoperable implementations. > > > > We have the following paragraph in the status section of > > the API doc: “The API is designed for both client- and server side > > implementations. > > > Not clear just from that text what it means. To me, client-side means it > runs e.g. within the page or an extension, > and server side means it runs within a server. > In either case we are talking about local calls, not remote procedure call. > > Client-server implementations are a third category, and and as they > involve > network communication, in an event-driven callback environment, > making them async is important, so that calling code does not hang. > > Depending on whether the API is implemented in a user agent > > or plugin, or as a web service, different communication patterns are more > > appropriate. > > > "Communication patterns"? API design or networ protocol? > > In the client side case, asynchronous access is typically > > preferred, while synchronous access is more appropriate for a web service. > > > This is the reverse of what I would have thought, assuming client-side > means local to the client, and 'web service' means a remote call > over the network. I assume the words are being used differently, > "client-side" meaning client-server, and "web service" meaning > server-local maybe? > > Thus the two version of the interface are not considered distinct features > > but different modes of access for the different use cases.” > > > > Different modes of access to the same implementation? > No, I gather not -- these are two quite incompatible APIs. > Not because they don't look similar in their parameters, > but because because if you need one and you have the > other, your code doesn't work. > > Interop means basically that if you have two products, one > says on its box "Needs x" and the other says on its box > "Provides x" and you install both, things work. > > Currently, this works with x as MR1.0-async or MR1.0-sync > but not x as MR1.0. > > In this case, you have to distinguish on the box whether > it is sync or async. If that is the case, then you have to be > up-front about it, the spec defines two APIs. you need to test both, > and ideally for each show 2 interoperable implementations. > > Tim > (Not with director decision hat on, just thinkin'). > > > > > > > > >
Received on Tuesday, 25 September 2012 20:26:33 UTC