Hello everybody;
I think using blank nodes is not a good practice. Shelley Powers mentioned
that and the why it is inconvenient on his book "Practical RDF", from the
page 21 of the first edition :
Blank nodes (sometimes referred to as bnodes or, previously, anonymous
> nodes) can
> be problematic within automated processes because the identifier that’s
> generated
> for each will change from one application run to the next. Because of
> this, you can’t
> depend on the identifier remaining the same. However, since blank nodes
> represent
> placeholder nodes rather than more meaningful nodes, this shouldn’t be a
> problem.
> Still, you’ll want to be aware of the nonpersistent names given to blank
> nodes by
> RDF parsers.
I think Yu Liang mentioned something similar to this on his book "A
Developer's Guide to the Semantic Web". But I am not sure of this last, you
may check it if you want.
Best regards;
Ahmed.
On 11 June 2013 11:20, Andrea Di Menna <[email protected]> wrote:
> Ciao Alessio,
>
> maybe this can be of help (but probably you are already aware of it):
>
> http://www.w3.org/TR/swbp-n-aryRelations/
>
> Wikidata is also discussing something similar:
>
> http://meta.wikimedia.org/wiki/Wikidata/Development/RDF
>
> I remember reading blank nodes are evil, but unfortunately I do not have
> enough experience to confirm/deny.
>
> Andrea
>
>
> 2013/6/11 Alessio Palmero Aprosio <[email protected]>
>
>> Ok, maybe I was not very clear in my previous mail: the problem was
>> whether to use blank nodes or string concatenation (or a proposal for a
>> better solution).
>> We can discuss the format in a different mail thread :)
>>
>> Alessio
>>
>>
>> Il 10/06/13 20:38, Paul A. Houle ha scritto:
>>
>> I am a fan of the SPARQL result set format whenever people want to
>> express tuples of nodes:
>>
>> http://www.w3.org/TR/sparql11-results-csv-tsv/
>>
>> I think it’s more standard than Turtle, and it is as efficient as you’ll
>> get unless you want a binary format.
>>
>> This file can be processed with simple streaming tools like awk or even
>> passed into something like Pig. If you want to load the facts into the
>> triple store you could just toss out the relevance rating or filter only
>> facts where the relevance rating is 9 or above. If you wanted to produce
>> the kind of RDF you suggest, you could do that too. You could also md5sum
>> the triples and stuff the relevance data in a key-value store where it
>> won’t add load to the triple store.
>>
>> *From:* Alessio Palmero Aprosio <[email protected]>
>> *Sent:* Monday, June 10, 2013 11:15 AM
>> *To:* dbpedia-discussion <[email protected]>
>> *Subject:* [Dbpedia-discussion] Airpedia resource
>>
>> Dear DBpedia community,
>> I am a PhD student from Fondazione Bruno Kessler [1] in Trento and I’m
>> working with my team on Airpedia [2], which is a semantic resource based on
>> machine learning techniques that aims to extend the coverage of DBpedia on
>> classes (and, in a second step, on properties).
>>
>> A draft version of the resource is available on our website. we are
>> currently working on releasing it to the Semantic Web Community, and
>> investigating on the best RDF format to use.
>>
>> Actually, we use a simple CSV format. For example:
>>
>> #ID Class Relevance
>> 140132 Eukaryote 10
>> 140132 Animal 10
>> 140132 Fish 10
>> 140132 Species 10
>> 140137 OlympicResult 8
>> 140143 Eukaryote 10
>> 140143 Amphibian 10
>> 140143 Animal 10
>> 140143 Species 10
>>
>> The ID column refers to a WikiData ID, and can be solved on the WikiData
>> website on the link http://wikidata.org/wiki/Q<ID>; the Class column is
>> the guessed DBpedia class; the Relevance column is our confidence about the
>> class (from 7 to 10, being a k-NN voting, k=10). It is really easy for us
>> to retrieve the DBpedia ID given the WikiData ID.
>>
>> Which is, in your opinion, the best way to represent this data in RDF,
>> keeping in mind that we want to differentiate our triples from the original
>> DBpedia ones and we want the relevance to be preserved?
>>
>> We have in mind the folowing candidate solutions.
>> (“air” is our RDF namespace)
>>
>>
>> *Solution 1** (string concatenation)*
>>
>> - ID air:type Class .
>> - ID_Class air:confidence Relevance .
>> - sameAses
>>
>> For example:
>> 140132 Eukaryote 10
>> 140132 Animal 10
>> 140132 Fish 10
>> 140132 Species 10
>>
>> becomes:
>> <http://airpedia.org/resource/140132><http://airpedia.org/resource/140132>
>> <http://airpedia.org/vocab/01/#type> <http://airpedia.org/vocab/01/#type>
>> <http://dbpedia.org/ontology/Eukaryote><http://dbpedia.org/ontology/Eukaryote>.
>> <http://airpedia.org/resource/140132_Eukaryote><http://airpedia.org/resource/140132_Eukaryote>
>> <http://airpedia.org/vocab/01/#confidence><http://airpedia.org/vocab/01/#confidence>“10”^^xsd:int
>> .
>> <http://airpedia.org/resource/140132><http://airpedia.org/resource/140132>
>> <http://airpedia.org/vocab/01/#type> <http://airpedia.org/vocab/01/#type>
>> <http://dbpedia.org/ontology/Animal> <http://dbpedia.org/ontology/Animal>.
>> <http://airpedia.org/resource/140132_Animal><http://airpedia.org/resource/140132_Animal>
>> <http://airpedia.org/vocab/01/#confidence><http://airpedia.org/vocab/01/#confidence>“10”^^xsd:int
>> .
>> <http://airpedia.org/resource/140132><http://airpedia.org/resource/140132>
>> <http://airpedia.org/vocab/01/#type> <http://airpedia.org/vocab/01/#type>
>> <http://dbpedia.org/ontology/Fish> <http://dbpedia.org/ontology/Fish> .
>> <http://airpedia.org/resource/140132_Fish><http://airpedia.org/resource/140132_Fish>
>> <http://airpedia.org/vocab/01/#confidence><http://airpedia.org/vocab/01/#confidence>“10”^^xsd:int
>> .
>> <http://airpedia.org/resource/140132><http://airpedia.org/resource/140132>
>> <http://airpedia.org/vocab/01/#type> <http://airpedia.org/vocab/01/#type>
>> <http://dbpedia.org/ontology/Species><http://dbpedia.org/ontology/Species>.
>> <http://airpedia.org/resource/140132_Species><http://airpedia.org/resource/140132_Species>
>> <http://airpedia.org/vocab/01/#confidence><http://airpedia.org/vocab/01/#confidence>“10”^^xsd:int
>> .
>> <http://airpedia.org/resource/140132><http://airpedia.org/resource/140132>owl:sameAs
>> <http://dbpedia.org/resource/Big_skate><http://dbpedia.org/resource/Big_skate>.
>> <http://airpedia.org/resource/140132><http://airpedia.org/resource/140132>owl:sameAs
>> <http://ca.dbpedia.org/resource/Raja_binoculata><http://ca.dbpedia.org/resource/Raja_binoculata>.
>> ...
>>
>>
>> *Solution 2** (blank nodes)*
>>
>> - ID air:isClassified bNode
>> - bNode air:type Class
>> - bNode air:confidence Relevance
>> - sameAses
>>
>> For example:
>> 140132 Eukaryote 10
>> 140132 Animal 10
>> 140132 Fish 10
>> 140132 Species 10
>>
>> becomes:
>> <http://airpedia.org/resource/140132><http://airpedia.org/resource/140132>
>> <http://airpedia.org/vocab/01/#isClassified><http://airpedia.org/vocab/01/#isClassified>_:1
>> .
>> _:1 <http://airpedia.org/vocab/01/#type><http://airpedia.org/vocab/01/#type>
>> <http://dbpedia.org/ontology/Eukaryote><http://dbpedia.org/ontology/Eukaryote>.
>> _:1
>> <http://airpedia.org/vocab/01/#confidence><http://airpedia.org/vocab/01/#confidence>“10”^^xsd:int
>> .
>> <http://airpedia.org/resource/140132><http://airpedia.org/resource/140132>
>> <http://airpedia.org/vocab/01/#isClassified><http://airpedia.org/vocab/01/#isClassified>_:2
>> .
>> _:2 <http://airpedia.org/vocab/01/#type><http://airpedia.org/vocab/01/#type>
>> <http://dbpedia.org/ontology/Fish> <http://dbpedia.org/ontology/Fish> .
>> _:2
>> <http://airpedia.org/vocab/01/#confidence><http://airpedia.org/vocab/01/#confidence>“10”^^xsd:int
>> .
>> <http://airpedia.org/resource/140132><http://airpedia.org/resource/140132>
>> <http://airpedia.org/vocab/01/#isClassified><http://airpedia.org/vocab/01/#isClassified>_:3
>> .
>> _:3 <http://airpedia.org/vocab/01/#type><http://airpedia.org/vocab/01/#type>
>> <http://dbpedia.org/ontology/Animal> <http://dbpedia.org/ontology/Animal>.
>> _:3
>> <http://airpedia.org/vocab/01/#confidence><http://airpedia.org/vocab/01/#confidence>“10”^^xsd:int
>> .
>> <http://airpedia.org/resource/140132><http://airpedia.org/resource/140132>
>> <http://airpedia.org/vocab/01/#isClassified><http://airpedia.org/vocab/01/#isClassified>_:4
>> .
>> _:4 <http://airpedia.org/vocab/01/#type><http://airpedia.org/vocab/01/#type>
>> <http://dbpedia.org/ontology/Species><http://dbpedia.org/ontology/Species>.
>> _:4
>> <http://airpedia.org/vocab/01/#confidence><http://airpedia.org/vocab/01/#confidence>“10”^^xsd:int
>> .
>> <http://airpedia.org/resource/140132><http://airpedia.org/resource/140132>owl:sameAs
>> <http://dbpedia.org/resource/Big_skate><http://dbpedia.org/resource/Big_skate>.
>> <http://airpedia.org/resource/140132><http://airpedia.org/resource/140132>owl:sameAs
>> <http://ca.dbpedia.org/resource/Raja_binoculata><http://ca.dbpedia.org/resource/Raja_binoculata>.
>> …
>>
>>
>> While waiting for your suggestions, we finish the classification and make
>> the CSV available on our website [2].
>>
>> Thank you!
>> Best,
>> Alessio
>>
>> [1] http://www.fbk.eu
>> [2] http://www.airpedia.org
>>
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