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Re: Update on PROV-O OWL file (Action item 55)

From: Satya Sahoo <satya.sahoo@case.edu>
Date: Thu, 16 Feb 2012 16:36:22 -0500
Message-ID: <CAOMwk6wuGw8sRMim0Bykjj1qqn4bSyRVd=XbmAFHfgpv7EVk=Q@mail.gmail.com>
To: Luc Moreau <L.Moreau@ecs.soton.ac.uk>
Cc: public-prov-wg@w3.org
Hi Luc,

>
> It's incorrect, WD3 does not associate time with Entity.
>
> Section 2.1.2.1, DM-TPWD:
"An entity generation event is the instantaneous
event<http://www.w3.org/TR/2012/WD-prov-dm-20120202/#dfn-event>that
marks the final instant of an entity's creation timespan, after which
it becomes available for use.

An entity usage event is the instantaneous
event<http://www.w3.org/TR/2012/WD-prov-dm-20120202/#dfn-event>that
marks the first instant of an entity's consumption timespan by an
activity."

Section 2.1.2.2, DM-TPWD:

"This specification only assumes that each instantaneous
event<http://www.w3.org/TR/2012/WD-prov-dm-20120202/#dfn-event>can be
mapped to an instant in some form of timeline."

Section 5.3.1, DM-TPWD:

"The following generation assertions

  wasGeneratedBy(e1,a1, 2001-10-26T21:32:52, [ex:port="p1", ex:order=1])
  wasGeneratedBy(e2,a1, 2001-10-26T10:00:00, [ex:port="p1", ex:order=2])

state the existence of two
events<http://www.w3.org/TR/2012/WD-prov-dm-20120202/#dfn-event>in the
world (with respective times
2001-10-26T21:32:52 and 2001-10-26T10:00:00), at which new entities,
represented by entity records identified by e1 and e2, are created by an
activity, itself represented by an activity record identified by a1."

Section 5.3.1.2, DM-TPWD:

"The following usage records

  used(a1,e1,2011-11-16T16:00:00,[ex:parameter="p1"])
  used(a1,e2,2011-11-16T16:00:01,[ex:parameter="p2"])

state that the activity, represented by the activity record identified by a1,
consumed two entities, represented by entity records identified by e1 and e2,
at times 2011-11-16T16:00:00 and 2011-11-16T16:00:01, respectively;"

Section 7.1, DM-TPWD:

"wasStartedByAgent-ordering, wasAssociatedWith-ordering" constraints.

Taken together, all the above statements describe association of Entity (or
its subclass Agent) with "event", which is in turn mapped to Time - in
effect, associating Entity with Time (each domain application is free to
decide "what" time).

Also, I believe the DM supports representation of a simple provenance
assertion such as, "The MonaLisa portrait is dated to circa 15031519"
(MonaLisa portrait is an Entity).

On a related note, I guess we need to resolve an outstanding issue of
whether to have a class for Event or Time, but the issue of Entity and
Activity both being associated with Event/Time is clear. Hence, Ivan's
original comment is still unresolved.

Thanks.

Best,

Satya


>
> On 16/02/12 20:45, Satya Sahoo wrote:
>
>> But as Luc replied the PROV-DM TPWD associated time information with both
>> Entity and Activity,
>>
>
> Luc
>
>
Received on Thursday, 16 February 2012 21:36:51 GMT

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