RE: [xri-comment] constraint on one-title-per-lang under Link?

[Eran Hammer-Lahav <eran@hueniverse.com>]

There isn’t any. Document authors should not include two titles with the same language. At the same time, I don’t see this as a problem that requires changing the spec to forbid it. Additionally, someone can later extend the Title element to make this useful (differentiating titles with the same language using another attribute).

 

It would be safe to assume that you can just use the first and ignore the rest. Since this is purely a human-readable label with no implications on link selection, it does not pose an interop problem. How people react to XRD information presented to them is outside our scope…

 

EHL

 

From: Joseph Smarr [mailto:jsmarr@google.com]
Sent: Tuesday, April 20, 2010 12:01 PM
To: xri-comment@lists.oasis-open.org
Subject: [xri-comment] constraint on one-title-per-lang under Link?

 

In reading through the current draft spec, it's not clear to me whether there is an explicit/implied constraint that there can be at most one <Title> element under a <Link> element per value of xml:lang. In other words, I'm hoping that the following is invalid, but I don't see that explicitly stated anywhere:

 

  <Link rel="http://spec.example.net/photo/1.0" type="image/jpeg"

    href=""http://photos.example.com/gpburdell.jpg">

    <Title xml:lang="en">User Photo</Title>

    <Title xml:lang="en">Second English Title</Title>

  </Link>

I don't see any value in providing multiple titles in the same language, and it's not clear what consumers should do with such a document if they find one (just take the first one and ignore the rest?). If you agree, I'd like to see that explicitly stated in the spec. Any objections?

(The reason I bring this up is that I'd like to specify a JSON representation of XRD, and I'm hoping I can have titles be represented as a map/object where the lang value is the key, e.g. "titles": { "en": "User Photo", "de": "German title", ... }, but I can only do that if the spec guarantees that each language can only appear once in a list of Title elements under a given <Link> element.)

Thanks, js