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我正在尝试为我的测试服务器构建正确的查询，但我遇到了无法定义 PREFIX 的问题。

例如，此查询有效：

select * where
{
   ?stayingURL <http://localhost/resource_lng> ?lng .
   ?stayingURL <http://localhost/resource_staying_date> ?date .
   ?stayingURL <http://localhost/resource_address> ?address .
}
LIMIT 100

我尝试按日期添加过滤器，就像这样：

select * where
{
   ?stayingURL <http://localhost/resource_lng> ?lng .
   ?stayingURL <http://localhost/resource_staying_date> ?date .
   ?stayingURL <http://localhost/resource_address> ?address .
   FILTER (?date > "2012-01-01"^^xsd:date)
}
LIMIT 100

现在我收到以下错误：“ MALFORMED QUERY: org.openrdf.query.parser.sparql.ast.VisitorException: QName 'xsd:date' uses an undefined prefix”

好的，我尝试通过将以下行添加到查询的开头来手动声明此前缀：

PREFIX xsd: <http://www.w3.org/2001/XMLSchema#>

现在我收到了这个错误：

MALFORMED QUERY: Encountered " "<" "< "" at line 1, column 14.
 Was expecting:
 <Q_IRI_REF> ...

这对我来说很奇怪，但无论如何我尝试直接写它，没有任何前缀：

select * where
{
 ?stayingURL <http://localhost/resource_lng> ?lng .
 ?stayingURL <http://localhost/resource_staying_date> ?date .
 ?stayingURL <http://localhost/resource_address> ?address .
 FILTER (?date > "2012-01-01"^^<http://www.w3.org/2001/XMLSchema#date> )
 }
LIMIT 100

结果几乎相同：

MALFORMED QUERY: Encountered " "<" "< "" at line 1, column 228.
Was expecting one of:
    <Q_IRI_REF> ...
    <PNAME_NS> ...
    <PNAME_LN> ...

我究竟做错了什么？

这是我的服务器地址： http://176.34.226.101:8080/openrdf-sesame/repositories/ ecomobile。

4

1 回答 1

4

如果我对所有query参数进行 URI 编码，它对我有用：

PREFIX xsd: <http://www.w3.org/2001/XMLSchema#>
select * where
{
 ?stayingURL <http://localhost/resource_lng> ?lng .
 ?stayingURL <http://localhost/resource_staying_date> ?date .
 ?stayingURL <http://localhost/resource_address> ?address .
 FILTER (?date > "2012-01-01"^^<http://www.w3.org/2001/XMLSchema#date> )
 }
LIMIT 100

这将是请求：

http://176.34.226.101:8080/openrdf-sesame/repositories/ecomobile?query=PREFIX%20xsd%3A%20%3Chttp%3A//www.w3.org/2001/XMLSchema%23%3E%20select%20 %2A%20where%0A%7B%0A%20%20%20%3FstayingURL%20%3Chttp%3A//localhost/resource_lng%3E%20%3Flng%20.%0A%20%20%20%3FstayingURL%20 %3Chttp%3A//localhost/resource_staying_date%3E%20%3Fdate%20.%0A%20%20%20%3FstayingURL%20%3Chttp%3A//localhost/resource_address%3E%20%3Faddress%20.%0A %20%20%20FILTER%20%28%3Fdate%20%3E%20%222012-01-01%22%5E%5Exsd%3Adate%29%0A%7D%0ALIMIT%20100

为神秘的不可读 URI 道歉......这里有一个简短的版本：

http://bit.ly/xTQhSV

于 2012-03-15T21:05:47.893 回答