Question: Is the mains voltage frequency in the Balearic Islands 220.0?
Paraphrase: What is the main voltage frequency in Baleric island?
SPARQL (Wikidata): SELECT ?value WHERE { wd:Q5765 p:P2884 ?s . ?s ps:P2884 ?x filter(contains(?x , '220.0')) . ?s pq:P2144 ?value}