Wikidata blazegraph | set labels preferred language

[alsora]

Hi,

I have reconstructed the Wikidata graph using BlazeGraph. All the standard queries work fine.

Now I would like to set a preferred language for the entities labels, as described here.

PREFIX wikibase: <http://wikiba.se/ontology#>
SERVICE wikibase:label {
  bd:serviceParam wikibase:language "en" .
 }

If I specify any language different from English ("en") all the queries returns empty.

Do you know what should I do in order to enable the possibility of setting different languages?

Thank you

[thompsonbry]

Adding Stas. Bryan

On Wed, May 30, 2018, 00:55 Alberto Soragna notifications@github.com wrote:

Hi,

I have reconstructed the Wikidata graph using BlazeGraph. All the standard queries work fine.

Now I would like to set a preferred language for the entities labels, as described here https://www.mediawiki.org/wiki/Wikidata_Query_Service/User_Manual#Extensions .

PREFIX wikibase: http://wikiba.se/ontology# SERVICE wikibase:label { bd:serviceParam wikibase:language "en" . }

If I specify any language different from English ("en") all the queries returns empty.

Do you know what should I do in order to enable the possibility of setting different languages?

Thank you

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[alsora]

@thompsonbry I'm sorry, what do you mean?

[thompsonbry]

Stas is the technical lead on wikidata and developed the label functionality. He is in a better position to answer this question. Bryan

On Thu, May 31, 2018 at 02:02 Alberto Soragna notifications@github.com wrote:

@thompsonbry https://github.com/thompsonbry I'm sorry, what do you mean?

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[smalyshev]

@alsora English is not special in any way for WDQS, so labels should work the same in any language. It would be nice to see full example query to figure out what is going on. Also you may want to check the labels actually exist, e.g. ?item rdfs:label ?label. FILTER(lang(?label) = 'fr') and alike.

[alsora]

@smalyshev ok thank you!

This is my query:

  SELECT DISTINCT ?item ?itemLabel  WHERE {
  SERVICE wikibase:label { bd:serviceParam wikibase:language "ja". }

    VALUES (?item) {
      (wd:Q1490)
    }

    #?item rdfs:label ?itemLabel. FILTER(lang(?itemLabel) = 'ja')

}
LIMIT 10

I have tried both the options for selecting the japanese label (specifying the language as bd:serviceParam and filtering on label languages).

This query executes fine on https://query.wikidata.org/ and the entity I'm looking for is the city of Tokyo, which obviously has a Japanese label =)

When I run this query on my blazegraph I get the following output:

• If I specify " SERVICE wikibase:label { bd:serviceParam wikibase:language "ja". }" then the system retrieves the entity, but its label is the item id (Q1490)

• If instead I use the filter on the label language "?item rdfs:label ?itemLabel. FILTER(lang(?itemLabel) = 'ja')" I do not get any result

[smalyshev]

Looks like you're missing non-English labels. You probably used "single language" option when munging/loading data.

[alsora]

Ok, thank you a lot!

I didn't noticed the parameter -l set to "en" for the munge.sh script.

[alsora]

Hi @smalyshev,

I have repeated all the process with the correct parameters. However I'm still experiencing strange results.

  SELECT DISTINCT ?item ?itemLabel  WHERE {
  SERVICE wikibase:label { bd:serviceParam wikibase:language "ja". }

    VALUES (?item) {
      (wd:Q1490)
    }  
}
LIMIT 10

Now when I run this query in the blazegraph workbench I finally see a result, but the itemLabel is not displayed correctly.

ItemLabel: ������������

The result is that I am not able to add constraints on the itemLabels inside the query.

  SELECT DISTINCT ?item ?itemLabel  WHERE {
  SERVICE wikibase:label { bd:serviceParam wikibase:language "ja". }

    VALUES (?item) {
      (wd:Q1744 )
    }

     ?item rdfs:label ?itemLabel.
     FILTER(REGEX(?itemLabel, "マドンナ"))

}
LIMIT 10

Do you know how can I properly set the encoding of these unicode languages?