Re: [xri] <SubjectTemplate>

[Dirk Balfanz <balfanz@google.com>]

I always thought that a host-meta (now XRD-for-a-host) was pointing to meta-data for the _host_, which is different from meta-data for _all resources on the host_. So something like (in the old syntax):

# assume this is the host-meta for bobs-blog.com:

Link: <http://pops-software-shop.com>; rel=author

Link-Pattern: <http://profiles.com/bob>; rel=author

would mean that the author of bobs-blog.com is pops-software-shop.com, but that the author of every single resource on bobs-blog.com is http://profiles.com/bob.

If we used something like

 

<XRD>

<SubjectTemplate>http://bobs-blog.com/*</SubjectTemplate>

...

</XRD>

to denote that this XRD is about the host, not a particular resource, then isn't this XRD about _every resource_ on bobs-blog.com, as opposes to the _host_ bobs-blog.com? How would we say the equivalent of the "Link: <http://pops-software-shop.com>; rel=author" line above?

And what's the difference in meaning between the first and second Link element in the following XRD:

<XRD>

<SubjectTemplate>http://bobs-blog.com/*</SubjectTemplate>

<Link>

  <Rel>author</Rel>

  <Uri>http://profiles.com/bob</Uri>

</Link>

<Link>

  <Rel>author</Rel>

  <UriTemplate>http://profiles.com/bob</UriTemplate>

</Link>

</XRD>

Dirk.

On Sun, Jun 28, 2009 at 12:37 PM, Eran Hammer-Lahav <eran@hueniverse.com> wrote:

This idea isn't new but given the need to solve the host-meta Subject use case, I would like to know what others here think about it.

EHL

-----Original Message-----
From: uri-request@w3.org [mailto:uri-request@w3.org] On Behalf Of Eran Hammer-Lahav
Sent: Sunday, June 28, 2009 12:32 PM
To: Erik Wilde; uri@w3.org
Subject: RE: URI for abstract concepts (domain, host, origin, site, etc.)

Using a URI template is one option being considered (XRD already has a <URITemplate> element under <Link> so the syntax is already part of XRD). However, that requires either creating a new element (like <SubjectTemplate>) or changing the XML schema type for <Subject> which currently does not allow anything but valid URIs.

But before we consider that, I wanted to see if there was an easy solution for describing such resources with a URI.

EHL

> -----Original Message-----
> From: uri-request@w3.org [mailto:uri-request@w3.org] On Behalf Of Erik
> Wilde
> Sent: Sunday, June 28, 2009 11:43 AM
> To: uri@w3.org
> Subject: Re: URI for abstract concepts (domain, host, origin, site,
> etc.)
>
> hello.
>
> Eran Hammer-Lahav wrote:
> > Let me try explaining my use case again, this time without any
> overloaded terminology or proposed solutions.
> > XRD is a document format for describing resources. It looks like
> this:
> > <XRD>
> >     <Subject>http://example.com</Subject>
> >     <Type>http://example.org/type/blog</Type>
> >     <Link>
> >             <Rel>author</Rel>
> >             <URI>http://example.com/author</URI>
> >     </URI>
> > </XRD>
> > Without getting too much into XRD, this short descriptor describes
> the resource identified by 'http://example.com'. It includes one type
> indicator (a made up example meant to mean this resource is a blog),
> and one link to the author's page.
> > I want to use this document format to describe rules that apply to
> all resources which belong to an HTTP host (as defined by 2616: a
> domain/address and port combination). The problem is, <Subject>
> requires a URI and currently there is no way to identify this set of
> resources (http://domain:port/*) as a valid URI.
> > What I don't want to do is use an exception such as 'if the URI
> begins with X, treat it as a rule and not a valid URI'...
>
> given this new description, isn't what you're looking for a URI
> template
> language for XRD? maybe not exactly the one currently proposed by
> http://tools.ietf.org/html/draft-gregorio-uritemplate-03, but isn't
> that
> close to what you want? a template notation would also nicely address
> the case mentioned already where the host scope would be too general.
> but then again, a URI template is not a URI, so you could use it in the
> context of XRD, but not as a standalone URI....
>
> cheers,
>
> erik wilde   tel:+1-510-6432253 - fax:+1-510-6425814
>         dret@berkeley.edu  -  http://dret.net/netdret
>         UC Berkeley - School of Information (ISchool)



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