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ProvenanceAccessScenario
Created by the Access and Query Task Force at the F2F1 to allow the WG to compare the different access proposals prepared and discussed at the meeting.
See ProvenanceAccessScenarioUsingPAQ for how these scenarios are satisfied by the Provenance Access and Query (W3C Editor's Draft 17 August 2011) proposal
Abstract Description
- A user obtains a document (D). The initial scenario will focus on an html document without inclusions such as javascript or images.
- The client software (browser, email client etc.) offers an "Oh yeah?" feature, by which provenance (P) of the document is accessed and maybe retrieved by the client software.
- Provenance for the complete document is accessed from the document provider as well as from third-parties.
- What does the client do when the feature is enacted?
- what information (I) does it need in order to perform the retrieval/access of provenance?
- where does information I come from?
- We should consider that document (D) was downloaded from the web, obtained from an email attachment, or found on a USB stick.
- We should consider that access control over provenance may be required
- Multiple formats for provenance may be available from the provider or third parties. The "Oh yeah?" feature may want to select which format to retrieve.
Issues to consider in the future:
- Could we rephrase without reference to provenance, say it refers to trust?
- Should we consider getting the provenance of the whole document or part of it?
- It is out of scope to reconcile potentially conflicting provenance
- How to retrieve provenance partially
Scenario rationale
- email/USB don't have a URL
- http/email have in band metadata
Concrete Example
As a concrete example for this access scenario, we start with a minimal document D whose text is:
<html>
<body>
<p>There was a lot of crime in London last month.</p>
</body>
</html>
The text There was a lot of crime in London last month. is a minimal portion of the hypothetical article art1 from the Data Journalism Example. All other components of art1 (i.e., the incidence map, chart, and photograph) are excluded from this scenario so we can focus on access, not modeling.
- Obtaining the document D
- Variety of sources: In this scenario, the document D can be obtained from the web at multiple locations: one (D1) or more (D2).
- Variety of document forms: To emphasize the fact that the text of document D (i.e., <html><body><p>There was a lot of crime in London last month.</p></body></html) can take a variety of forms, an image on github (D3) and an email's image attachment (D4) are available.
- Variety of source types: The same document D available on the web (D1-4) and accessed through a web browser can also be obtained through email as an attachment (e.g., the two emails with html (D5) and png (D6) attachments sent to public-prov-wg@w3.org) accessed through an email client. These different forms of the document D can also be on your local hard drive or USB drive, such as the files //acme/downloads/crime.html (D7) and e:\usbShare\crime.png (D8), accessible through a command shell.
- Enacting the "Oh yeah?" feature
- A user requests a web browser (W) used to obtain the web documents (D1-4) to enact the "Oh yeah?" feature on the whole documents
- A user requests an email client (E) used to obtain the email attachments (D5-6) to enact the "Oh yeah?" feature on the whole documents
- A user requests a command shell (S) used to obtain the files (D7-8) to enact the "Oh yeah?" feature on the whole documents
- Accessing the provenance
- What information (I) do the clients (W, E, S) need in order to access and retrieve the provenance for the documents D1-8? The provenance may have access control.
- Where does the information (I) come from for the different forms and sources of the document?