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Re: [model] Clarifying annotation architecture

From: Jacob Jett <jjett2@illinois.edu>
Date: Wed, 22 Jul 2015 16:16:22 -0500
Message-ID: <CABzPtBJUjG+C+T5MYNp9+FYz5EY51YAGmOsMQCVHQHFBGvDk6A@mail.gmail.com>
To: "Denenberg, Ray" <rden@loc.gov>
Cc: Robert Sanderson <azaroth42@gmail.com>, Frederick Hirsch <w3c@fjhirsch.com>, W3C Public Annotation List <public-annotation@w3.org>
Hi Ray,

This is a distinctly RDF thing. Essentially the triples are all distinct
assertions.

Imagine that I told you, "the sky is red". In ttl we might write the
assertion this way --
     Sky colored Red .

This statement is true at certain points in time. Unfortunately RDF does
not have a way to scope the assertion to certain points in time (or in the
roles example, specific contexts). So from the SemWeb perspective "Sky
colored Red ." and "Sky colored Blue ." are both true at all times and in
all places. Using the specific resource allows us to scope the assertions,
e.g., Sky@time@place colored Red .

Is that example helpful at all?

I think Rob's suggestion is a reasonable work around for this role issue.
It should be invisible to those who don't care about SemWeb issues and
makes the data reasonably actionable for those who do.

Regards,

Jacob


_____________________________________________________
Jacob Jett
Research Assistant
Center for Informatics Research in Science and Scholarship
The Graduate School of Library and Information Science
University of Illinois at Urbana-Champaign
501 E. Daniel Street, MC-493, Champaign, IL 61820-6211 USA
(217) 244-2164
jjett2@illinois.edu

On Wed, Jul 22, 2015 at 4:00 PM, Denenberg, Ray <rden@loc.gov> wrote:

> There is a fundamental piece of this that I’m missing.
>
> {
>
>   "@type": "Annotation",
>
>   "target": "some-uri.html",
>
>   "body": {
>
>     "@type": "SpecificResource",
>
>     "motivation" : "editing",
>
>     "source": "meme-image.jpg"
>
>   }
>
>
>
> You create a new resource (specific resource) in order to associate a
> motivation (editing) with the original resource (source).
>
>
>
> And you do this to avoid  “directly assigning a role to the original
> resource”.
>
>
>
> I understand the reason why.  What I don’t understand is how it is
> proposed to do the latter in the first place.  In the example, the original
> resource is an image. Not like it’s an RDF description that you can stick
> an RDF  triple into.
>
>
> What am I missing here?
>
>
>
> Ray
>
>
>
>
>
> *From:* Robert Sanderson [mailto:azaroth42@gmail.com]
> *Sent:* Wednesday, July 22, 2015 2:45 PM
> *To:* Frederick Hirsch
> *Cc:* W3C Public Annotation List
> *Subject:* Re: [model] Clarifying annotation architecture
>
>
>
>
>
>
>
>
>
> > * Associate the role with the body directly.  Fails because it makes the
> body un-reusable, which for the image/video or similar case is not
> acceptable.
>
>
> This statement is a key issue and I think Doug was asking about this as
> well during the call.
> The failure scenario is not clear. Un-resuable  : re-used by whom and for
> what?
>
>
>
> Reused anywhere by anyone for anything, but most importantly reused as a
> body in a different annotation with a different role.
>
> As per Doug's example, you could not use the meme image as a comment in
> one annotation and a replacement in another annotation.
>
>
>
>
>
> If I forget the semantic web (for a moment) I can have an object, say a
> body, that has properties, including hasSegment or role and two bodies
> could have different values for the properties.
>
>
>
> Sure. If I forget that I need to close my tags and put quotes around my
> single token attributes, I end up with SGML ... but that sure isn't XML.
> Or if we conveniently forget about HTTP requirements, we could not worry
> about all those pesky headers. We could just stuff everything in the URL
> ... that would be much simpler, no? Then you would only ever need to do a
> GET, and could type it into your browser bar.
>
>
>
>
>
> The only re-use issue would be an implementation optimization (e.g. I
> don't want to duplicate an embedded image/video to save space)
>
> In semantic web terms:
> annotation1 has body1.
> annotation1 has body2.
> body1 hasRole A.
> body2 hasRole B.
>
>
>
> annotation2 has body1
>
> body1 hasRole B.
>
>
>
> Now body1 has both A and B roles.
>
>
>
>
>
> so where is the problem, and where is the re-use?
>
>
>
> There was no problem until someone else (annotation2) also assigned a
> different role to the body, and now it has both of them at once.
>
>
>
>
>
> > * Associate the role (motivation) with a specific resource. Works as
> expected without changing the semantics, breaking linked data, or
> introducing any new classes or properties.
>
> isn't a body a resource? If it isn't a resource, what is it?
>
>
>
> Well... the preferred answer would be yes, it's a resource.  But it's also
> a literal string :P
>
> However snark aside, I'm not sure as to what's prompting the question?
>
>
>
> Perhaps to clarify the bullet:  ... with a oa:SpecificResource.
>
>
>
> {
>
>   "@type": "Annotation",
>
>   "target": "some-uri.html",
>
>   "body": {
>
>     "@type": "SpecificResource",
>
>     "motivation" : "editing",
>
>     "source": "meme-image.jpg"
>
>   }
>
> }
>
>
>
> R
>
>
>
>
> --
>
> Rob Sanderson
>
> Information Standards Advocate
>
> Digital Library Systems and Services
>
> Stanford, CA 94305
>
Received on Wednesday, 22 July 2015 21:17:31 UTC

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