Querying DBpedia for English-only description (wit

问题:

I'm querying dbpedia.org for a description of Big Ben with this SPARQL query:

select ?desc 
where {
<http://dbpedia.org/resource/Big_Ben> <http://www.w3.org/2000/01/rdf-schema#comment> ?desc
}

This returns a list of descriptions in at least 10 different languages. How do I specify that I only want the English language description?

回答1:

The keys you need to know are that str() and lang() pull apart the text and language of the value, so you can do this:

select str(?desc) 
where {
  <http://dbpedia.org/resource/Big_Ben> <http://www.w3.org/2000/01/rdf-schema#comment> ?desc
  FILTER (langMatches(lang(?desc),"en"))
}