'Compacts' link and use of 'Prefer' request header

[Martin P Pain <martinpain@uk.ibm.com>]

I won't be available for the beginning
of today's Core meeting (due to the clock change causing a conflict for
me), but I have some comments to contribute:

1. Version 18 of the draft for the 'Prefer'
request header [1] states "implementors ... SHOULD NOT use the Prefer
header mechanism for content negotiation". It seems to me that we
would be using this for content negotiation. (Not that I have a better
suggestion, it still sounds better to me than using Content-Type).

2. Secondly, I've come across the idea
in other RDF/semantic web writings of using one URI to identify a resource
and a different URI to identify the document (informational resource(?))
that describes it (if the main resource is not itself the information resource
describing itself) . e.g. this is mentioned in [2]. This is something I
noticed did not seem to be addressed or mentioned in OSLC 2.0, in particular
with the compact representation.
If we add this 'compacts' link then
I presume it would link from the URI for the informational resource for
the compact document to the URI for the resource that has been "compacted"?

e.g. in response to this GET request:

  GET /resource1 HTTP/1.1
  Host: example.com
  Accept: text/turtle
  Prefer: compact

There would be something like this response:

  HTTP/1.1 200 OK
  Content-Type: text/turtle
  Vary: Prefer, Accept
  Content-Location: /resource1.compact.ttl
  
  @prefix oslc: <...>.
  @prefix dcterms: <...>.
  
  <http://example.org/resource1.compact.ttl>
    oslc:compacts <http://example.org/resource1>;
    .
  
  <http://example.org/resource1>
    dcterms:title "Resource
1";
    oslc:shortTitle "1";
    oslc:icon "http://example.org/resource.png";
  .


Is my understanding of what is being
suggested correct? (If not, what is the subject & object of the 'compacts'
link ).

[1] http://tools.ietf.org/html/draft-snell-http-prefer-18#page-6
[2] Section 2.3 "Making URIs defererenceable"
in: Heath, T., Bizer, C. (2011) Linked Data: Evolving the Web into a
Global Data Space. Morgan & Claypool. Retrieved from http://linkeddatabook.com/editions/1.0/#htoc11

Martin Pain
Software Developer - Green Hat
Rational Test Virtualization Server, Rational Test Control Panel
Open Services for Lifecycle Collaboration - Automation WG joint chair

E-mail: martinpain@uk.ibm.com Find me on:  and within IBM on:

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