我试图在http://sparql.sindice.com/上进行此查询
PREFIX rev: <http://purl.org/stuff/rev#>
PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>
SELECT *
WHERE
{
?thing rdfs:label ?name .
?thing rev:hasReview ?review .
filter regex(str(?name), "harlem", "i")
} LIMIT 10
它返回 504 Gateway Time-out 服务器没有及时响应。我做错了什么?谢谢。