Hi Lucas,

many thanks! This helps a lot. There are all these small details which are not easy to find.

Best regards Detlef

On 02.04.17 11:59, Lucas Werkmeister wrote:

Hi,

labels in Wikidata are multilingual and are mapped to RDF literals with a language tag. This query finds three results (though only one of them has a date of birth):

SELECT ?_Geburtsdatum WHERE { ?s ?label "Brian O'Nolan"@en. OPTIONAL { ?s wdt:P569 ?_Geburtsdatum. } }

This one, on the other hand, only has one result (@de instead of @en):

SELECT ?_Geburtsdatum WHERE { ?s ?label "Brian O'Nolan"@de. OPTIONAL { ?s wdt:P569 ?_Geburtsdatum. } }

I hope that helps.

Cheers, Lucas

On 02.04.2017 08:33, Detlef Küchler wrote:

...

Hi,

I got the following problem. If I use the search field of the main page searching for "Brian O'Nolan" I get a result. But if I use the following piece of code in the query service no result shows up.

SELECT ?_Geburtsdatum WHERE { ?s ?label "Brian O'Nolan". OPTIONAL { ?s wdt:P569 ?_Geburtsdatum. } }

What I'm doing wrong? Is it a problem of coding the apostrophe? If yes, how do I have to code it?

Best regards Detlef