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Re: PROV-ISSUE-189: Section 5.2.4 (PROV-DM as on Nov 28) [prov-dm]

From: Luc Moreau <L.Moreau@ecs.soton.ac.uk>
Date: Thu, 08 Dec 2011 09:48:03 +0000
Message-ID: <EMEW3|f702875bd5a726d956e93137b69677b1nB79m608L.Moreau|ecs.soton.ac.uk|4EE087D3.8030409@ecs.soton.ac.uk>
To: public-prov-wg@w3.org
Hi Satya,
Response interleaved.

On 12/07/2011 02:00 AM, Provenance Working Group Issue Tracker wrote:
> PROV-ISSUE-189: Section 5.2.4 (PROV-DM as on Nov 28) [prov-dm]
> http://www.w3.org/2011/prov/track/issues/189
> Raised by: Satya Sahoo
> On product: prov-dm
> Hi,
> The following are my comments for Section 5.2.4 of the PROV-DM (as on Nov 28):
> Section 5.2.4 Note Record
> 1. "Attribute-value pairs occurring in notes differ from attribute-value pairs occurring in entity records and activity records. In entity and activity records, attribute-value pairs must be a representation of something in the world, which remain constant for the duration of the characterization interval (for entity record) or the activity duration (for activity records). In note records, it is optional for attribute-value pairs to be representations of something in the world. If they are a representation of something in the world, then it may change value for the corresponding duration. If attribute-value pairs of a note record are a representation of something in the world that does not change, they are not regarded as determining characteristics of an entity or activity, for the purpose of provenance."
> Comments: The primary issue is - how is note record enabling provenance representation or interchange over and above the set of terms and relations defined by PROV-DM?

I really see this as an annotation mechanism, to add extra information 
over an existing set of records.
I think it's important to have it for interoperability, otherwise, we 
have now easy way of enriching an exist provenance record.

> If attribute-value pairs are determining characteristics of an Entity or Activity and also help in rendering them - are they not Note Record? For a common user or application, how do they determine if a set of attribute-value pairs are determining characteristics of an Entity or Activity? Would the original author of provenance assertions have to be around to convey this information to users or consumers of provenance information?

I agree the text is not straightforward,.

We were also trying to avoid the distinction between determining and 
non-determining characteristic. So it needs rephrasing.

Maybe, we should write something:

A note record associated with an entity record consist of 
attribute-value pairs which may or may not represent the entity's 
situation in the world.
If a note record's attribute-value pair represents an entity's situation 
is world, no requirement is made on this situation to be unchanged for 
the entitys' characterization interval.

> E.g.
> entity (e1, [resolution: 1080p, format: UTF-8])
> How does a user or software application intrepret that the attribute pairs [resolution: 1080p, format: UTF-8] are determining characteristics of e1 or not?
> Further, what is meant by "...something in the world"? Section 2.1.1 describes world as "...the world (whether real or not), there are things, which can be physical, digital, conceptual, or otherwise, and activities involving things." - so what IS something in the world and what is NOT something in the world?

resolution: 1080p, format: UTF-8 are supposed to hold during the duration of the entity interval.

> Thanks.
> Best,
> Satya

Professor Luc Moreau
Electronics and Computer Science   tel:   +44 23 8059 4487
University of Southampton          fax:   +44 23 8059 2865
Southampton SO17 1BJ               email: l.moreau@ecs.soton.ac.uk
United Kingdom                     http://www.ecs.soton.ac.uk/~lavm
Received on Thursday, 8 December 2011 09:48:44 UTC

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