Re: [namedgraphs] SPARQL over named graphs with blank nodes

[Blom, J.J.C. (Jaap) <jb...@cr...>]

Hi again,

Sorry forgot about this for a bit.

<snip>
> But only for debugging purposes. Right? I mean, this data is meant to be processed automatically and an application doesn't care about labels.
</snip>

Well if that means that running in debugging mode actually enables bugs, that may not be the best approach. Since I had the choice of keeping the TRIX a bit readable or putting in labels that seemed to cause errors (not sure why and the details have since escaped me). So now I declare logical named blank nodes everywhere (assuming ARQ would hold itself to the principles of RDF). So I may want to turn back on that decision.

<snip>
> I don't see a problem here. If you import such data into a Jena Model (or
> Graph) then Jena automatically creates unique blank node identifiers.
</snip>

Well actually I import it in TriX for transporting and I checked, that means the blank node labels aren't renamed. So that means I would need to loop through all the named graphs and do it. Not something I would want to implement for such a thing tbh.

<snip>
> Yes, I think it is a problem in Jena. NG4J uses the Jena implementation of triple pattern matching over a union of RDF graphs which is implemented in > > the 'MultiUnion' class (package 'com.hp.hpl.jena.graph.compose'); more precisely, the method 'multiGraphFind'
</snip>

Kay, thanks.

Greetings,
  Jaap Blom

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