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

[Maxence Guesdon]

On Wed, 22 Feb 2012 10:28:52 +1300
David Brooks <d.brooks at auckland.ac.nz> wrote:

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

Thanks, didn't know it was already available. Great !

Regards,

Maxence
> 
> 
> 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