Question

我正在阅读InputStream中的RDF文档，如下所示（scala语法）：

def foo(rdfData: InputStream, dialect: String = null) = {
  require(List("RDF/XML", "N-TRIPLE", "TURTLE", "TTL", "N3", "RDF/XML-ABBREV").contains(dialect) || dialect == null)
  val model: Model = ModelFactory.createDefaultModel
  model.read(rdfData, null, dialect)
  doSomethingWithTriplesIterator(model.listStatements())
}

现在，有些三元组输入了文字，所以我做了类似的事情：

val it = model.listStatements()
it.next.getObject.toString

我得到（有时）类似于"13"^^<http://www.w3.org/2001/XMLSchema#int>或"Hello world"@en_US的内容，当我只对字符串值感兴趣时，即13＆amp;在给定的例子中Hello world。

有没有办法让jena的陈述中的“裸”价值变得明确？如果是这样，怎么样？感谢。

修改

尝试 AndyS 解决方案，使用从yago获取的三元组，我得到了：

scala> val model = ModelFactory.createDefaultModel
model: com.hp.hpl.jena.rdf.model.Model = <ModelCom   {} | >

scala> val is = new java.io.ByteArrayInputStream("""<http://yago-knowledge.org/resource/Mount_Cramer> <http://yago-knowledge.org/resource/hasLatitude> "44.01102^^http://yago-knowledge.org/resource/degrees" .""".getBytes("UTF-8"))
is: java.io.ByteArrayInputStream = java.io.ByteArrayInputStream@2b3c4f10

scala> model.read(is, null, "N-TRIPLE")
res0: com.hp.hpl.jena.rdf.model.Model = <ModelCom   {http://yago-knowledge.org/resource/Mount_Cramer @http://yago-knowledge.org/resource/hasLatitude "44.01102^^http://yago-knowledge.org/resource/degrees"} |  [http://yago-knowledge.org/resource/Mount_Cramer, http://yago-knowledge.org/resource/hasLatitude, "44.01102^^http://yago-knowledge.org/resource/degrees"]>

scala> val it = model.listStatements
it: com.hp.hpl.jena.rdf.model.StmtIterator = com.hp.hpl.jena.rdf.model.impl.StmtIteratorImpl@55ef662c

scala> val stmt = it.next
stmt: com.hp.hpl.jena.rdf.model.Statement = [http://yago-knowledge.org/resource/Mount_Cramer, http://yago-knowledge.org/resource/hasLatitude, "44.01102^^http://yago-knowledge.org/resource/degrees"]

scala> val obj = stmt.getObject
obj: com.hp.hpl.jena.rdf.model.RDFNode = 44.01102^^http://yago-knowledge.org/resource/degrees

scala> val ltrl = obj.asLiteral
ltrl: com.hp.hpl.jena.rdf.model.Literal = 44.01102^^http://yago-knowledge.org/resource/degrees

scala> ltrl.getLexicalForm
res1: String = 44.01102^^http://yago-knowledge.org/resource/degrees

所以如你所见，我没有得到所需的输出。我做错了什么？

Answer 1

你想要的是lexical form。请参阅Literal.getLexicalForm。

jena typed literals＆amp;语言注释 - 如何在导出时省略它？

1 个答案: