Getting thumbnail of DBpedia resource with SPARQL

Question

This query works:

select ?value { 
 <http://dbpedia.org/resource/Henrik_Ibsen> dbpedia-owl:abstract ?value
 filter langMatches(lang(?value),"en")
}

To get the thumbnail I assume I can simply change to dbpedia-own:thumbnail like this:

select ?value { 
 <http://dbpedia.org/resource/Henrik_Ibsen> dbpedia-owl:thumbnail ?value
 filter langMatches(lang(?value),"en")
}

But it returns empty value. Both the dbpedia-owl:abstract and the dbpedia-owl:thumbnail properties exist: http://dbpedia.org/page/Henrik_Ibsen

Anyone see what is wrong with the query?

Answer 1

A thumbnail is a Resource, identified by a URI. Resources do not have language tags (only plain Literals do), so by filtering out all values for ?value that do not have a language tag en, you filter out the thumbnail Resource.