[foaf-dev] [foaf-protocols] revisiting FOAF project goals

Melvin Carvalho melvincarvalho at gmail.com
Thu Jun 25 14:10:20 CEST 2009


On Thu, Jun 25, 2009 at 1:26 PM, Olaf
Hartig<hartig at informatik.hu-berlin.de> wrote:
> On Thursday 25 June 2009 12:19:09 Matthew Rowe wrote:
>> Hi Olaf
>>
>> Thanks for the comments.
>>
>> On 25 Jun 2009, at 06:14, Olaf Hartig wrote:
>> > [...]
>> > :Bob tv:trustworthiness [ rdf:type tv:TrustValue ;
>> >                                       rdfs:value 0.9 ;
>> >                                       tv:truster :Alice ]
>>
>> I like this form but I think there is an issue about how different
>> people interpret trust. From a philosophical perspective when we say
>> that we trust someone:
>>
>> Do we simply trust someone in general? i.e. In the broad sense of the
>> term? Alice trusts Bob
>> or
>> Do we trust a person given a context? i.e. Alice trust Bob's opinion
>> on the Semantic Web
>>
>> I am more inclined to say the latter.
>
> Definitely agree. Trust is not only subjective but also contextual.
>
>> Is there are any way this could be included in your vocabulary as something
>> like:
>>
>> Bob: tv:trustworthiness [rdf:type tv:TrustValue;
>>                       rdfs:value 0.9 ;
>>                       tv:truster :Alice;
>>                       tv:context <http://dbpedia.org/resource/Semantic_Web> ]
>
> My trust model for RDF statements does not consider context explicitly because
> I was assuming that the applications that provide implementations for the
> trust function know the context. Hence, the trust functions should already be
> contextual. For this reason the vocabulary -which was originally only meant
> for my trust model- does not contain something like a tv:context property.
> However, to be useful in the more general case the vocabulary should provide
> such a property. I will add it. Thanks for pointing this out.

There's also:

<trust:TrustStatement rdf:ID="s111" >
   <trust:trustor>
        <trust:Agent rdf:about="A" />
   </trust:trustor>
   <trust:trustee>
        <trust:Agent rdf:about="B" />
   </trust:trustee>
   <trust:action>
        <trust:Action rdf:about="X" />
   </trust:action>
   <trust:begin>T1</trust:begin>
   <trust:end>T2</trust:end>
   <trust:constraint>
        <trust:Constriant rdf:about="Y" />
   </trust:constraint>
   <trust:level>
        <trust:TrustLevel>
            <trust:metric
                        rdf:resource="http://example.org/trustMetric" />
            <trust:level>0.8</trust:level>
        </trust:TrustLevel>
   </trust:level>
</trust:TrustStatement>

http://www.w3.org/2001/sw/Europe/reports/trust/11.2/d11.2_trust_vocabularies.html#2

>
> Greetings,
> Olaf
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