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Re: PROV-ISSUE-449: Better definition of prov:value [prov-dm]

From: Luc Moreau <l.moreau@ecs.soton.ac.uk>
Date: Tue, 04 Sep 2012 16:42:28 +0100
Message-ID: <EMEW3|52ee44f28d821b8e3756fd9a91f0779co83GgW08l.moreau|ecs.soton.ac.uk|50462164.5050800@ecs.soton.ac.uk>
To: public-prov-wg@w3.org
Hi Tim and Jim,

Do you want to make a suggestion for a definition of prov:value?

I see prov:value as the equivalent of "immediate operands" in assembly 
language :
"/An operand that is directly encoded as part of a machine instruction 
is called an immediate operand/. [1] "

So, to get the ball rolling, attempting a definition:
prov:value is an attribute whose value is a direct representation of an 
entity as a PROV-DM Value(5.7.3).

Cheers,

Luc


[1] http://chortle.ccsu.edu/assemblytutorial/Chapter-11/ass11_2.html

On 17/07/12 17:01, Timothy Lebo wrote:
> Graham noted in his prov-o review [1]:
>
> [[[
>   But, maybe more fundamentally, is there any specified way to express a value that is itself denoted by a URI?
>   In OWL terms, this needs an object property. It's OK if ther4e's no such way, as one can always introduce new properties,
>   but it seems odd to me that data values are OK but other values are not.
> ]]]
>
>
>
> After discussing this with Jim McCusker, I'm convinced that prov:value is the literal analogue to prov:specializationOf.
>
> In:
>        :my_calculation_result prov:value 4.5 .
>
> or
>         :my-copied-test prov:value "For score" .
>
> Both subjects _are_ specializations of their objects, and their objects have relatively few fixed aspects (abstract mathematical relationship, a string length, etc).
>
>
>
> I'm not sure if we want to mix prov:specializationOf into the discussion of prov:value, but this ISSUE is about the need for a clearer definition of prov:value.
>
> Also, I think the answer to Graham's question is "we have a way to express a value of a URI - prov:specializationOf".
>
>
> Thanks,
> Tim
>
>
>
>
>
> [1] http://www.w3.org/2011/prov/wiki/Review_of_prov-o_july_3_2012_for_last_call#Graham
>
>
>
> On Jul 9, 2012, at 5:39 PM, Provenance Working Group Issue Tracker wrote:
>
>> PROV-ISSUE-449: Better definition of prov:value [prov-dm]
>>
>> http://www.w3.org/2011/prov/track/issues/449
>>
>> Raised by: Timothy Lebo
>> On product: prov-dm
>>
>> Although we know that prov:value is very useful,
>>
>> http://dvcs.w3.org/hg/prov/raw-file/default/model/prov-dm.html#term-attribute-value
>>
>> does not provide a satisfactory definition.
>>
>> We are copying rdf:value: http://www.w3.org/TR/rdf-schema/#ch_value which provides an equally unsatisfying definition:
>>
>> [[[
>> rdf:value is an instance of rdf:Property that may be used in describing structured values.
>>
>> rdf:value has no meaning on its own. It is provided as a piece of vocabulary that may be used in idioms such as illustrated in example 16 of the RDF primer [RDF-PRIMER]. Despite the lack of formal specification of the meaning of this property, there is value in defining it to encourage the use of a common idiom in examples of this kind.
>> ]]]
>>
>> Can we do better?
>>
>> Thanks,
>> Tim
>>
>>
>>
>>
>>
>

-- 
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 Tuesday, 4 September 2012 15:43:01 GMT

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