Re: RDF addDatasource

Le 09/02/2012 13:41, Axel Hecht a écrit :
> On 09.02.12 12:10, Pernot Christian wrote:
>> Le 09/02/2012 10:42, Neil a écrit :
>>> Pernot Christian wrote:
>>>
>>>> We're currently dealing with RDF datasources.
>>>> We use one RDF for displaying a tree (dont-build-content), and we'd
>>>> like to update and add parts of the tree dynamically.
>>>>
>>>> We use the compositeDatasource to add RDFDatasources, but it does not
>>>> work if the elements in the new datasource were already present in the
>>>> original datasource. We really want the new datasaource to overwrite
>>>> existing parts, I thought the coalesceDuplicateArcs should deal with
>>>> this case, but it is not (maybe the RDF we build does not have the
>>>> required attributes ?)
>>>
>>> Maybe you need to allowNegativeAssertions and use those to disable the
>>> existing parts?
>>>
>> We already have allowNegativeAssertions = true on the composite
>> datasource, but maybe is there something we need to put in the rdf so it
>> understands it better ?
>
> I think you can only add negative assertions by overlaying an in-mem
> resource, or otherwise explicitly add an arc to the DS that has a
> negative truth value.
>
> Axel
Could You please explain or give an example of a "negative truth value" 
in the DS ?

Thank you