[redland-dev] Problem or misunderstanding with CONSTRUCT and blank nodes

[David Brooks]

I would use "DELETE WHERE { ... }" -- see 
http://www.w3.org/TR/sparql11-update/#deleteInsert.


Regards,
Dave

On 22/02/12 12:29 AM, Maxence Guesdon wrote:
> On Tue, 21 Feb 2012 21:52:48 +1300
> David Brooks<d.brooks at auckland.ac.nz>  wrote:
>
>> Hi Maxence,
> Hello,
>
>> Blank nodes are anonymous -- the nodes without labels in a visual graph
>> of your model.
>>
>> In an RDF store these nodes are given identifiers in order to include
>> the nodes in statements. The actual value of a blank node's identifier
>> though is local to the graph it is part of. Generating another graph via
>> a query is very likely to assign different values, and even two
>> identical queries against the same graph are likely to return different
>> blank node identifiers.
> Thanks for your answer. So that's a feature.
>
> The reason why I encountered this problem is that I wanted to remove a part
> of my model. So this query was supposed to return the statements to remove
> from my model.
>
> I have to do it another way. For information, since I have no experience
> yet of performing such an operation, what is your favorite way of removing
> part of your model when it contains blank nodes ? I mean, the less painful
> one, of cource :-)
>
> Regards,
>
> Maxence