freebase? (also datasets and schema)

[zz]

Hi

please correct me if im wrong but according to "https://
docs.google.com/spreadsheet/ccc?
key=0AlaKL6ismHRNdEs2UkNjTUN3OXd6VFJvSWpDX2txOVE#gid=0" or the "get-me-
all-datasets-in-sindice"-sparql-query, freebase is not currently
indexed by sindice?

Another question relevant to this is, is there a way to get the schema/
ontology/vocabulary used to describe each dataset? (e.g., "http://
www.w3.org/2002/07/owl", "http://dbpedia.org/ontology")

I found it very cumbersome to explore the datasets by sparql because i
have to manually look for the possible vocabularies with each dataset
in order to query them.

Any tips please, many thanks!

[Gabi Vulcu]

 Hi zz,

Thanks for showing interest in our sparql endpoint.
As you correctly mentioned you can find out which datasets we currently store in two ways:
 1. querying the sparql endpoint by  using the example query provided on the website
 2. checking up this more up to date list: https://docs.google.com/spreadsheet/ccc?key=0AvdgRy2el8d9dGhDaHMta0MtaG9vWWhhbTd5SVVaX1E#gid=0


Indeed, at the moment we do not store the freebase dataset, but instead we have the basekb dataset which is also a rdf-ization of freebase. http://basekb.com. Maybe that could help you until we figure out a way of getting freebase on our endpoint.


Regarding the vocabulary used by each dataset, you can query something like the following:

PREFIX dataset: <http://vocab.sindice.net/dataset/1.0/>
     SELECT ?dataset_uri ?dataset_name ?dataset_type ?triples ?snapshot ?vocabulary
     FROM <http://sindice.com/dataspace/default/dataset/index>
     WHERE {
        ?dataset_uri dataset:type ?dataset_type ;
        dataset:name ?dataset_name .
        OPTIONAL {
            ?dataset_uri dataset:void ?void_graph ;
                         dataset:snapshot ?snapshot .
            GRAPH ?G {
                ?dataset_uri void:triples  ?triples ;
                                    void:vocabulary ?vocabulary.
            }
        }
     } limit 40
  

Please note that each of our dataset dumps have some metadata attached described using the void vocabulary: http://www.w3.org/TR/void/


Maybe this one will give you a bit more insight of what you should expect from each dataset.

Let me know if there is anything else  Icould help you with,

Regards,
Gabi

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[Renaud Delbru]

To explore and learn the vocabulary of a dataset, you can also our
(unreleased) schema visualisation explorer at
http://demo.sindice.net/dataset/

Kind Regards
--
Renaud Delbru

> <http://docs.google.com/spreadsheet/ccc>?

> key=0AlaKL6ismHRNdEs2UkNjTUN3OXd6VFJvSWpDX2txOVE#gid=0" or the "get-me-
> all-datasets-in-sindice"-sparql-query, freebase is not currently
> indexed by sindice?
>
> Another question relevant to this is, is there a way to get the schema/
> ontology/vocabulary used to describe each dataset? (e.g., "http://

> www.w3.org/2002/07/owl <http://www.w3.org/2002/07/owl>",

> "http://dbpedia.org/ontology")
>
> I found it very cumbersome to explore the datasets by sparql because i
> have to manually look for the possible vocabularies with each dataset
> in order to query them.
>
> Any tips please, many thanks!
>
> --
> You received this message because you are subscribed to the Google
> Groups "Sindice Developers" group.
> To post to this group, send email to sindi...@googlegroups.com

> <mailto:sindi...@googlegroups.com>

> To unsubscribe from this group, send email to
> sindice-dev...@googlegroups.com

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[zz]

Thanks! Both are extremely useful!

On Sep 24, 5:18 pm, Renaud Delbru <renaud.del...@deri.org> wrote:
> To explore and learn the vocabulary of a dataset, you can also our

> (unreleased) schema visualisation explorer athttp://demo.sindice.net/dataset/

>
> Kind Regards
> --
> Renaud Delbru
>
> On 24/09/12 17:04, Gabi Vulcu wrote:
>
>
>
>
>
>
>
> >   Hi zz,
>
> > Thanks for showing interest in our sparql endpoint.
> > As you correctly mentioned you can find out which datasets we currently
> > store in two ways:
> >   1. querying the sparql endpoint by  using the example query provided
> > on the website
> >   2. checking up this more up to date list:

> >https://docs.google.com/spreadsheet/ccc?key=0AvdgRy2el8d9dGhDaHMta0Mt...

> >    http://sindice.comhttp://sig.mahttp://www.deri.ie

[ziqi zhang]

Hi

An outdated topic but I have another question about this...

On Monday, September 24, 2012 5:04:09 PM UTC+1, Gabi wrote:

 
Regarding the vocabulary used by each dataset, you can query something like the following:

PREFIX dataset: <http://vocab.sindice.net/dataset/1.0/>
     SELECT ?dataset_uri ?dataset_name ?dataset_type ?triples ?snapshot ?vocabulary
     FROM <http://sindice.com/dataspace/default/dataset/index>
     WHERE {
        ?dataset_uri dataset:type ?dataset_type ;
        dataset:name ?dataset_name .
        OPTIONAL {
            ?dataset_uri dataset:void ?void_graph ;
                         dataset:snapshot ?snapshot .
            GRAPH ?G {
                ?dataset_uri void:triples  ?triples ;
                                    void:vocabulary ?vocabulary.
            }
        }
     } limit 40
  

I have tried the above query but seen that for most datasets, the "?vocabulary" is empty. I then revised the query as below  to get a list of distinct vocabularies:

PREFIX dataset: <http://vocab.sindice.net/dataset/1.0/> 

       SELECT distinct 

 ?vocabulary 

       FROM <http://sindice.com/dataspace/default/dataset/index> 

       WHERE { 

          ?dataset_uri dataset:type ?dataset_type ; 

          dataset:name ?dataset_name . 

          OPTIONAL { 

              ?dataset_uri dataset:void ?void_graph ; 

                           dataset:snapshot ?snapshot . 

              GRAPH ?G { 

                  ?dataset_uri void:triples  ?triples ; 

                                      void:vocabulary ?vocabulary. 

              } 

          } 

       } 

But I only get 11 results:

http://dbpedia.org/ontology/

http://www4.wiwiss.fu-berlin.de/medicare/data/

http://purl.org/dc/dcmitype/

http://www.w3.org/2002/07/owl#

http://rdf.ookaboo.com/object/

http://rdf.basekb.com/ns

http://www.geonames.org/ontology#

http://purl.org/vocabularies/princeton/wn30/

http://www4.wiwiss.fu-berlin.de/dailymed/data/

http://www.w3.org/2001/XMLSchema#

http://reference.data.gov.uk/id/year/ I think that is imcomplete... can you comment on this please? Thanks!

[Gabi Vulcu]

Hi

The vocabulary propery, as part of the voID metadata is available only for the dump datasets atm and not for the website datasets.

Regards,

Gabi

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