ProvenanceAccessScenarioUsingPAQ

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Walk through of how the Provenance Access Scenario is satisfied using the Provenance Access and Query (W3C Editor's Draft 17 August 2011) proposal.

Online HTML Documents D1 and D2 (Resource provider aware of provenance)

  • Obtaining the document D
  • HTML documents D1 and D2 are accessed using HTTP GET, and the web servers return provenance and anchor Link: headers. We show examples using both the alternate proposals for anchor as a parameter and as a relation.

Using anchor parameter

GET https://github.com/timrdf/vsr/raw/master/data/source/tim-lebo/london-crime/version/2011-Jul-07/manual/crime.html HTTP/1.1
...

HTTP/1.1 200 OK
...
Link: http://example.com/provenance/d1.prov; rel="provenance"; anchor="https://github.com/timrdf/vsr/raw/master/data/source/tim-lebo/london-crime/version/2011-Jul-07/manual/crime.html"

GET http://lists.w3.org/Archives/Public/public-prov-wg/2011Jul/att-0031/crime.html HTTP/1.1
...

HTTP/1.1 200 OK
...
Link: http://example.com/provenance/d2.prov; rel="provenance"; anchor="http://lists.w3.org/Archives/Public/public-prov-wg/2011Jul/att-0031/crime.html"

Using anchor relation

GET https://github.com/timrdf/vsr/raw/master/data/source/tim-lebo/london-crime/version/2011-Jul-07/manual/crime.html HTTP/1.1
...

HTTP/1.1 200 OK
...
Link: http://example.com/provenance/d1.prov; rel="provenance"; 
Link: https://github.com/timrdf/vsr/raw/master/data/source/tim-lebo/london-crime/version/2011-Jul-07/manual/crime.html; rel="anchor" 

GET http://lists.w3.org/Archives/Public/public-prov-wg/2011Jul/att-0031/crime.html HTTP/1.1
...

HTTP/1.1 200 OK
...
Link: http://example.com/provenance/d2.prov; rel="provenance"; 
Link: http://lists.w3.org/Archives/Public/public-prov-wg/2011Jul/att-0031/crime.html; rel="anchor" 
  • Accessing the provenance
  • What information (I) does the clients (W) need in order to access and retrieve the provenance for the documents D1-2?
  • The browser uses the default mechanism for dereferencing the provenance-uris I_P for the two documents, which in our example is using a HTTP GET to retrieve the provenance document P.
  • The browser examines the provenance document P to locate the "section" that corresponds to the context-uri I_C that is relevant for the documents D1 and D2.

Online Image Document D3 (Resource provider aware of provenance)

This case is similar to the previous in all respects. The fact that the document D3 is an image and not a HTML document makes no difference. The HTTP GET request and response are shown as example. The means for enacting the "Oh yeah?" button and accessing the provenance are the same as before.

Using anchor parameter

GET https://github.com/timrdf/vsr/raw/11e4a2ab0315ba7808a393e2a0b5f69f952b7235/data/source/tim-lebo/london-crime/version/2011-Jul-07/manual/crime.png HTTP/1.1
...

HTTP/1.1 200 OK
...
Link: http://example.com/provenance/d1.prov; rel="provenance"; anchor="https://github.com/timrdf/vsr/raw/11e4a2ab0315ba7808a393e2a0b5f69f952b7235/data/source/tim-lebo/london-crime/version/2011-Jul-07/manual/crime.png"


Using anchor relation

GET https://github.com/timrdf/vsr/raw/11e4a2ab0315ba7808a393e2a0b5f69f952b7235/data/source/tim-lebo/london-crime/version/2011-Jul-07/manual/crime.png HTTP/1.1
...

HTTP/1.1 200 OK
...
Link: http://example.com/provenance/d1.prov; rel="provenance"; 
Link: https://github.com/timrdf/vsr/raw/11e4a2ab0315ba7808a393e2a0b5f69f952b7235/data/source/tim-lebo/london-crime/version/2011-Jul-07/manual/crime.png; rel="anchor" 
 

HTML Documents D5 and D7 as Email attachments or in File System

  • Obtaining the document D
  • HTML document D5 arrived as an attachment to the email http://lists.w3.org/Archives/Public/public-prov-wg/2011Jul/0031.html while HTML document D7 is present in the file system at //acme/downloads/crime.html. The contents of these documents are accessible to the local client.
  • The HTML documents have Link elements embedded under in their HTML HEAD section as follows:
<html>
  <head>
    <link rel="provenance" href="http://example.com/provenance/d5_d7.prov">
    <link rel="anchor" href="urn:uuid:2d26db96-7174-4c26-9353-cbbf9b5991d2">
  </head>
  <body>
<p>There was a lot of crime in London last month.</p><pre>
   </body> 
 </html>

* ''Enacting the "Oh yeah?" feature''
* ''A user requests an email client ('''E''') and a command shell ('''S''') used to obtain the HTML document (D5, D7) to enact the "Oh yeah?" feature on the whole documents''
*# Both clients examine the HTML documents '''D5''' and '''D7''' to identify the ''Link'' elements present under in the HTML ''HEAD'' section.

== Online Image Document D4 ''(Resource provider NOT aware of provenance)'' ==

== Image Documents D6 and D8 as Email attachments or in File System  ==