ProvenanceAccessScenarioUsingPAQ
From Provenance WG Wiki
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* '''Enacting the "Oh yeah?" feature''' | * '''Enacting the "Oh yeah?" feature''' | ||
** ''A user requests a web browser (W) used to obtain the web documents (D1-2) to enact the "Oh yeah?" feature on the whole documents'' | ** ''A user requests a web browser (W) used to obtain the web documents (D1-2) to enact the "Oh yeah?" feature on the whole documents'' | ||
| - | *# The web browser examines the HTTP response header of the documents to identify '''Link:''' headers | + | *# The web browser examines the HTTP response header of the documents to identify '''Link:''' headers and selects those that contain the relations, ''provenance'' or ''anchor''. |
| - | + | *# The browser extracts the ''provenance-uri'' information, '''I_P'', from the ''provenance'' relation header. In the above example, '''I_P''' is ''http://example.com/provenance/d1.prov'' for '''D1''' and ''http://example.com/provenance/d2.prov'' for '''D2'''. | |
| - | *# | + | *# The browser also extracts the ''context-uri'' information, '''I_C''', from the headers if the ''anchor'' parameter or relation were present. Otherwise, it uses the URL to the documents '''D1''' and '''D2''' that was used to access them as the value of '''I_C'''. In the above example, the anchor parameter or relation was present and the value of '''I_C''' is ''https://github.com/timrdf/vsr/raw/master/data/source/tim-lebo/london-crime/version/2011-Jul-07/manual/crime.html'' and ''http://lists.w3.org/Archives/Public/public-prov-wg/2011Jul/att-0031/crime.html'' for '''D1''' and '''D2''' respectively. |
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== Online Image Documents D3 and D4 == | == Online Image Documents D3 and D4 == | ||
Revision as of 12:09, 18 August 2011
Walk through of how the Provenance Access Scenario is satisfied using the Provenance Access and Query (W3C Editor's Draft 17 August 2011) proposal.
Contents |
Online HTML Documents D1 and D2
- Obtaining the document D
- HTML documents D1 and D2 are accessed using HTTP GET, and the servers return Link: headers as follows (using both 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"
- Enacting the "Oh yeah?" feature
- A user requests a web browser (W) used to obtain the web documents (D1-2) to enact the "Oh yeah?" feature on the whole documents
- The web browser examines the HTTP response header of the documents to identify Link: headers and selects those that contain the relations, provenance or anchor.
- The browser extracts the provenance-uri information, I_P, from the provenance relation header. In the above example, I_P' is http://example.com/provenance/d1.prov for D1 and http://example.com/provenance/d2.prov for D2.
- The browser also extracts the context-uri information, I_C, from the headers if the anchor parameter or relation were present. Otherwise, it uses the URL to the documents D1 and D2 that was used to access them as the value of I_C. In the above example, the anchor parameter or relation was present and the value of I_C is https://github.com/timrdf/vsr/raw/master/data/source/tim-lebo/london-crime/version/2011-Jul-07/manual/crime.html and http://lists.w3.org/Archives/Public/public-prov-wg/2011Jul/att-0031/crime.html for D1 and D2 respectively.
