java - xsd :dateTime in SPARQL query with Jena? 的数据类型格式异常

Question

我正在尝试对格式为 xsd:dateTime 的 RDF 属性应用范围查询。这是我的查询:

PREFIX xsd: <http://www.w3.org/2001/XMLSchema#> 
SELECT ?x WHERE { ?y <DATE:> ?x . 
FILTER(?x>"2014-06-05T10:10:10+0530"^^xsd:dateTime) }

它给出警告但没有任何结果:

WARN [main] (Log.java:78) - Datatype format exception: "2014-06-11T12:44:22+0530"^^xsd:dateTime

我不明白这是什么问题？我仅以 xsd:dateTime 格式存储该属性。

Answer 1

I have stored the property in xsd:dateTime format only.

简单的回答是不，您没有将该值存储为 xsd:dateTime。标准xsd:dateTime说:

The lexical space of dateTime consists of finite-length sequences ofcharacters of the form: '-'? yyyy '-' mm '-' dd 'T' hh ':' mm ':' ss ('.' s+)? (zzzzzz)?

您的日期时间的一部分与此匹配，即 2014-06-05T10:10:10。然而，

zzzzzz (if present) represents the timezone (as described below).

当我们往下看时，我们看到

The lexical representation of a timezone is a string of the form:(('+' | '-') hh ':' mm) | 'Z', where

• hh is a two-digit numeral (with leading zeros as required) that represents the hours,
• mm is a two-digit numeral that represents the minutes,
• '+' indicates a nonnegative duration,
• '-' indicates a nonpositive duration,
• 'Z' indicates a zero-timezone offset (UTC+0).

您的时区不匹配。我认为您可能是指 +05:30。因此应该有

"2014-06-05T10:10:10+05:30"^^xsd:dateTime

果然，如果我们使用Jena的命令行工具qparse:

$ qparse --query query.rq # the original query, warnigns
14:12:22 WARN  NodeValue            :: Datatype format exception: "2014-06-05T10:10:10+0530"^^xsd:dateTime
14:12:22 WARN  NodeValue            :: Datatype format exception: "2014-06-05T10:10:10+0530"^^xsd:dateTime
14:12:22 WARN  NodeValue            :: Datatype format exception: "2014-06-05T10:10:10+0530"^^xsd:dateTime
PREFIX  xsd:  <http://www.w3.org/2001/XMLSchema#>

SELECT  ?x
WHERE
  { ?y <DATE:> ?x
    FILTER ( ?x > "2014-06-05T10:10:10+0530"^^xsd:dateTime )
  }

$ qparse --query query.rq # the updated query, no warnings
PREFIX  xsd:  <http://www.w3.org/2001/XMLSchema#>

SELECT  ?x
WHERE
  { ?y <DATE:> ?x
    FILTER ( ?x > "2014-06-05T10:10:10+05:30"^^xsd:dateTime )
  }