[Monetdb-developers] RDF

Marco Antonelli M.Antonelli at cwi.nl
Fri Apr 18 10:10:45 CEST 2008


Hi Pieter,
hi MonetDB developers,

to clarify what I wrote to Pieter, I have to say that an eventual 
integration of MonetDB as Sesame backend will not be done by us, but by 
the Sesame team. Thus, if my words sounded like a promise in that sense, 
  their are not.

Sorry for the misunderstanding,
Marco

Marco Antonelli ha scritto:
> Hello Pieter,
> 
> I'm the master thesis student who started the SPARQL front-end for 
> MonerDB this January.
> 
> Bellekens, P.A.E. ha scritto:
>> Dear MonetDB developers,
>>
>> I have a question related to RDF.
>> In you PDF online, I see that it is possible to import RDF in the MonetDB system, 
>> although there is not much further information concerning RDF input.
> 
> may you send a link to the PDF?
> 
>> Could you please inform me a bit more about:
>> - is it possible to upload RDF data?
> 
> Actually it is possible to import and export RDF in MonetDB, but this 
> functionality will be under heavy development starting from the next week.
> If you want to get a look at the code, the import-export functions are 
> defined in MonetDB5/src/modules/mal/rdf.mx.
> It is not compiled by default, to getting it compiled you have to modify 
> the Makefile.ag file in the same directory, then run 'bootstrap', 
> 'configure', 'make' and 'make install'.
> 
>> - is there any kind of RDF specific querying?
> 
> Still not, the SPARQL compiler is under development too
> 
>> - is it possible to run MonetDB as a backend in a triple store like for example in Sesame?
> 
> Not at the moment, but MonetDB will be a backend for Sesame in the next 
> future
> 
>> - is there any performance measuring done for RDF querying? 
>> It is known that column stores have a good performance (c-store benchmarks) for RDF data as well...
> 
> Lefteris and Romulo can answer you on these topics more in detail than me
> Anyway MonetDB/SQL performed well in querying RDF data :)
> 
> Best regards,
> Marco Antonelli
> 
>> With kind regards,
>> Pieter
>>
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