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Re: prov-dm attributes: two proposals to vote on (deadline Wednesday midnight GMT)

From: Stian Soiland-Reyes <soiland-reyes@cs.manchester.ac.uk>
Date: Wed, 2 Nov 2011 12:22:15 +0000
Message-ID: <CAPRnXtkaQ+4v5BFNQzrB1em_DTZcGN72y8gknSvjPn1s4whs5w@mail.gmail.com>
To: Luc Moreau <l.moreau@ecs.soton.ac.uk>
Cc: W3C provenance WG <public-prov-wg@w3.org>
+1 to both proposals
 On Oct 30, 2011 5:57 PM, "Luc Moreau" <l.moreau@ecs.soton.ac.uk> wrote:

> In the interest of simplification, we would like to make the following
> proposal about attributes in prov-dm.
> Proposal 1: attributes are a necessary part of prov-dm. Attribute-value
> pairs can be optionally
>  included in Entity Expressions and Activity Expressions.
> The document will justify their presence along the following lines
> (text to be worked on, suggestions welcome). For inter-operability
> purpose, it is necessary to be able to describe entities (and
> activities), and such descriptions need to be part of the provenance
> record, so that queries over such descriptions can be expressed.  The
> document will not make the distinction between non-characterizing and
> characterizing attributes. All attributes will be considered as
> describing some facet of the entity.
> Proposal 2: Constraints related to attributes will be dropped.
> http://www.w3.org/TR/2011/WD-**prov-dm-20111018/#derivation-**attributes<http://www.w3.org/TR/2011/WD-prov-dm-20111018/#derivation-attributes>
> http://www.w3.org/TR/2011/WD-**prov-dm-20111018/#use-**attributes<http://www.w3.org/TR/2011/WD-prov-dm-20111018/#use-attributes>
> http://www.w3.org/TR/2011/WD-**prov-dm-20111018/#generation-**
> affects-attributes<http://www.w3.org/TR/2011/WD-prov-dm-20111018/#generation-affects-attributes>
> Rationale: a number of issues have been raised against these
> constraints. They may or may be fixable. But overall, they seem to
> overconstraint the model, for benefits that are unclear.  There was no
> intent to make them automatically verifiable, for
> instance. Furthermore, if it is really crucial for some developers to
> express that some attributes depend on others, than prov-dm already
> offers a mechanism: simply model these attributes as entities, and their
> dependency as derivation.
> A further consequence is that derivation can be made transitive!
> (subject of a separate proposal)
> Finally, the semantics team may want to reconsider these constraints and
> formalize them properly.
> Cheers,
> Luc
Received on Wednesday, 2 November 2011 12:22:55 UTC

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