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Re: [Glossary] Portable Digital Document's states

From: Ivan Herman <ivan@w3.org>
Date: Tue, 15 Sep 2015 06:56:17 +0200
Cc: W3C Digital Publishing IG <public-digipub-ig@w3.org>, Ralph Swick <swick@w3.org>
Message-Id: <D6E3F483-5A4C-4989-A673-63235F9766B9@w3.org>
To: Brady Duga <duga@google.com>

> On 14 Sep 2015, at 15:43 , Brady Duga <duga@google.com> wrote:
> 
> Local and remote instead of packed and unpacked?

Doesn't the same issue arise as with online vs. offline? I can have, on my laptop, the same document side-by-side in a package (say, an EPUB file) as well as part of my directory structure. They would be both 'local', wouldn't they?

> The use of "one unit" is odd, since presumably you could have a PDD that is in several files, spread across multiple folders. What is the unit it was packed into?

Hm. I must admit that, for me, a packed PDD is in one file. Just like EPUB, in this sense. Do you have an example of a packed PDD spreading across multiple files?

> Also, these are not necessarily disjoint - parts of a PDD could be remote while other parts are cached. Maybe just clarify that any components of a PDD in a cache are considered remote? Makes sense, since browser caches tend to be transient.

In fact, as I said, the whole idea of "cached" is sort of fuzzy to me and I am not sure that we should single it out as a separate state. In many respect, a cache may be considered as some sort of an (important!) implementation strategy rather than a separate state. But I am not sure, tho be honest.

> 
> As for the term User Agent, EPUB intentionally uses Reading Systems to avoid confusion with a browser UA. A Reading System uses composition (has-a) instead of inheritance (is-a) as the relationship to a UA. It may not be quite technically correct, but it makes clear that a RS may be more than a local browser (it includes any polyfills, server components, etc).

It was my mistake to bring in another term in the discussion, my apologies. Brady, is it o.k. if we postpone this discussion (the term is on the list of pending items on the Glossary page) or we push it into a separate thread? I am a little bit afraid of mixing up discussion that would make things very messy.

Thanks

Ivan

> 
> On Mon, Sep 14, 2015 at 4:15 AM, Ivan Herman <ivan@w3.org <mailto:ivan@w3.org>> wrote:
> Hi all,
> 
> Trying to move on to some other terms that we have to agree upon: states. Maybe this is less controversial.
> 
> As a reminder: the "Requirement for Web Publication and Packaging"[1] currently defines the following states and their characterization:
> 
> 	• Online state (i.e., a collection of documents on the Web that can be considered as a logical unit, a "Web Publication")
> 	• Cached state (i.e., a collection of documents in the reading engine, local system, etc., that can be considered as a logical unit and which is mostly indistinguishable from the online state)
> 	• Portable state (i.e., an package, ie, a collections of documents packed into one unit for, e.g., a file system, network transfer, etc, but whose content is mostly indistinguishable from the online state)
> 
> However, with the terminology around Portable Digital Document (PDD) now written down[2], these definitions must be re-visited. The problems I see are:
> 
> - All defintions should be based on the PDD and there are, clearly, overlaps and redundancies
> - I am not sure that the terms 'offline' or 'online' are precise and should be used. For example, if I have a PDD on my laptop, and I serve the PDD through a server running on it (ie, using a URL based on http://localhost <http://localhost/>) then I get a proper display even if I am offline. So in which state would the PDD be?
> 
> Here is my first attempt in reformulating the states' terms:
> 
> [[[
> A Portable Digital Document can be
> 	• in Unpacked State, when all constituent Web Resources can be directly accessed through standard protocols like HTTP, FTP, etc.
> 	• in Cached State, when all constituents Web Resources are stored in the User Agent, and the final delivery of the resources in the document are otherwise indistinguishable from when in an Unpacked State
> 	• in Packed State, when all constituents Web Resources are combined into one unit for, e.g., storage in a file system, network transfer, etc.
> ]]]
> 
> (I am not absolutely convinced, at this point, that the "Cached State" is useful, but I do not have a very strong feeling about it.)
> 
> At first glance, it does not fundamentally change our requirement document[1] (which is good)
> 
> WDYT?
> 
> Ivan
> 
> P.S. Note that I use "User Agent" as a more general form. This is the terminology we often use at W3C which, I believe, supersedes both 'Reading Systems' and 'Browsers'. I believe that, also in the spirit of EPUB+WEB, we should stick to this term…
> 
> 
> [1] https://www.w3.org/dpub/IG/wiki/Requirements_for_Web_Publication_and_Packaging <https://www.w3.org/dpub/IG/wiki/Requirements_for_Web_Publication_and_Packaging>
> [2] https://www.w3.org/dpub/IG/wiki/Glossary <https://www.w3.org/dpub/IG/wiki/Glossary>
> 
> 
> ----
> Ivan Herman, W3C
> Digital Publishing Lead
> Home: http://www.w3.org/People/Ivan/ <http://www.w3.org/People/Ivan/>
> mobile: +31-641044153 <tel:%2B31-641044153>
> ORCID ID: http://orcid.org/0000-0003-0782-2704 <http://orcid.org/0000-0003-0782-2704>
> 
> 
> 
> 
> 


----
Ivan Herman, W3C
Digital Publishing Lead
Home: http://www.w3.org/People/Ivan/
mobile: +31-641044153
ORCID ID: http://orcid.org/0000-0003-0782-2704





Received on Tuesday, 15 September 2015 04:56:26 UTC

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