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Re: concept illustrations for the data journalism example

From: Olaf Hartig <hartig@informatik.hu-berlin.de>
Date: Thu, 12 May 2011 14:05:53 +0200
To: public-prov-wg@w3.org
Message-Id: <201105121405.54880.hartig@informatik.hu-berlin.de>

(sorry, I messed something up with the email addresses - I sent some mails to 
the old XG list - it should be fixed now)

On Thursday 12 May 2011 13:42:30 Luc Moreau wrote:
> Olaf and Paul,
> [...]
> Time is important no doubt, and not made explicit in the scenario.
> What does it mean to be performedAt? Time at which process execution
> took place?

In the Provenance Vocabulary prv:performedAt is a possible property of a 
prv:Execution (representing the completed execution of a process). Thus,
yes, prv:performedAt refers to the time at which the execution took place.

> Is it instaneous?

The rdfs:range of prv:performedAt is xsd:dateTime. Hence, it is instaneous. 
And (before you ask ;)  we always understood this instant to refer to the 
point in time when the execution completed - we should make that more
explicit in the documentation.

> has it a duration?

The Provenance Vocabulary has nothing for durations.

> Is it the time at which
> the DataItem
> is produced?

If the prv:Execution is a prv:DataCreation and the prv:DataItem has been 
prv:createdBy that, then yes.


> Can we express these questions and answer them independently of a
> terminology?
> Luc
Received on Thursday, 12 May 2011 12:08:50 UTC

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