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Re: Comments on the current data model

From: Simon Miles <simon.miles@kcl.ac.uk>
Date: Tue, 11 Oct 2011 13:46:28 +0100
Message-ID: <CAKc1nHffeRhnFAtJYy9ZGAzSru5=UEBXtmQdauaS4Cr2fQqwuw@mail.gmail.com>
To: Provenance Working Group WG <public-prov-wg@w3.org>
Hi Luc,

> I don't understand your multiple granularities. Can you explain?

I mean, to use an old example, that a cake may be reasonably be
asserted to be generated by a BakeCake execution and also by a
CookInOven execution, because the latter is a finer grained
description than the former. The assertions could be by the same
asserter or two different asserters.

Before accounts are mentioned, this seems perfectly reasonable - why
would we disallow such a description? However, we have a restriction
that, for an account to be valid, each entity can only be generated by
one execution within that account. This suggests to me that he
restriction is about accounts and their validity rather than
generation events.


> Luc
> On 10/10/2011 17:42, Simon Miles wrote:
>> I can't see what it would mean without knowledge of accounts, or how
>> it could be "correct without qualification". Surely it is simply not
>> true that only one PE can generate an entity independently of
>> accounts? Why do we not allow multiple granularities of description?

Dr Simon Miles
Lecturer, Department of Informatics
Kings College London, WC2R 2LS, UK
+44 (0)20 7848 1166
Received on Tuesday, 11 October 2011 12:47:04 UTC

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