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Re: Request to register "identifier" relation type

Michael Nelson <mln@cs.odu.edu> Mon, 07 August 2017 15:54 UTC

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Date: Mon, 07 Aug 2017 11:53:41 -0400
From: Michael Nelson <mln@cs.odu.edu>
To: Ed Summers <ehs@pobox.com>
CC: Herbert Van de Sompel <hvdsomp@gmail.com>, Peter Williams <pezra@barelyenough.org>, Geoffrey Bilder <gbilder@crossref.org>, Simeon Warner <simeon.warner@cornell.edu>, "John A. Kunze" <jak@ucop.edu>, link-relations <link-relations@ietf.org>
Subject: Re: Request to register "identifier" relation type
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Hi Ed,

My guess, based up reading:

https://www.w3.org/TR/html5/links.html#link-type-bookmark

is that an HTML doc can have multiple rel="bookmark" attributes, since 
it's seems to be used to specify relationships between the target page and 
specific elements within the source page.  To borrow from a scholarly 
example, to me it seems like reference citation context ("article B was 
referenced in this section of the article A").

The example from the link above:

  The following snippet has three permalinks. A user agent could determine
  which permalink applies to which part of the spec by looking at where the
  permalinks are given.

  ...
  <body>
   <h1>Example of permalinks</h1>
   <div id="a">
    <h2>First example</h2>
    <p><a href="a.html" rel="bookmark">This permalink applies to
    only the content from the first H2 to the second H2</a>. The DIV isn't
    exactly that section, but it roughly corresponds to it.</p>
   </div>
   <h2>Second example</h2>
   <article id="b">
    <p><a href="b.html" rel="bookmark">This permalink applies to
    the outer ARTICLE element</a> (which could be, e.g., a blog post).</p>
    <article id="c">
     <p><a href="c.html" rel="bookmark">This permalink applies to
     the inner ARTICLE element</a> (which could be, e.g., a blog 
comment).</p>
    </article>
   </article>
  </body>
  ...


If I'm understanding it correctly (and I'm not 100% sure on that), then 
that would be the reason you could not have a single value in Link, since 
it's purpose seems to be almost the inverse (obverse?) of <A 
name="foo"></a>.

To me, it seems like a weird corner case that has parked on an otherwise 
good term.  Like rel="archives" ;-)

regards,

Michael

On Mon, 7 Aug 2017, Ed Summers wrote:

> Hi Herbert,
>
> Thanks for your responses.
>
>> On Aug 5, 2017, at 8:56 AM, Herbert Van de Sompel <hvdsomp@gmail.com> wrote:
>>
>> Our I-D acknowledges that the semantics of "identifier" are similar to "bookmark". But "bookmark" is explicitly not allowed in <link> (and hence Link). One has to assume there were/are reasons for that choice because other rel types declared in HTML can be used in <link>.
>
> Just to close the loop I thought I'd ask over on the whatwg discussion list [1] to see if anyone remembers why res=bookmark can't be used with <link>. It doesn't look like it's generating significant discussion, but I figured it was worth a shot.
>
> Since HTML is a "living standard" one would think that it could be changed without too much fuss unless, as you say, it was debated before and decided against.
>
> //Ed
>
> [1] https://lists.w3.org/Archives/Public/public-whatwg-archive/2017Aug/0001.html
>

----
Michael L. Nelson mln@cs.odu.edu http://www.cs.odu.edu/~mln/
Dept of Computer Science, Old Dominion University, Norfolk VA 23529
+1 757 683 6393 +1 757 683 4900 (f)

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