Datatype format exception for xsd:dateTime in SPARQL query with Jena?

问题

I am trying to apply a range query on a property of the RDF which is of xsd:dateTime format. This is my query:

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

It gives warning and nothing as result:

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

I don't understand what the problem is? I have stored the property in xsd:dateTime format only.

回答1:

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

The simple answer is that no, you have not stored the value as an xsd:dateTime. The standard xsd:dateTime says:

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

Part of your dateTime matches that, viz., 2014-06-05T10:10:10. However,

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

When we look below, we see

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.

Your timezone doesn't match that. I think you probably meant +05:30. and thus should have

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

Sure enough, if we use Jena's command line tool 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 )
  }

来源：https://stackoverflow.com/questions/24166518/datatype-format-exception-for-xsddatetime-in-sparql-query-with-jena

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java

xsd

rdf

sparql

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