使用OWL API在Turtle中序列化装载本体

Question

Turtle中的本体如下所示。我用一个Jena模型来储存它。注意：下面的本体论不正确，如下面的答案所述

@prefix owl:   <http://www.w3.org/2002/07/owl#> .
@prefix rdf:   <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
@prefix xsd:   <http://www.w3.org/2001/XMLSchema#> .
@prefix rdfs:  <http://www.w3.org/2000/01/rdf-schema#> .

<http://example.com/minimalDecoupling>
        a           "http://www.w3.org/2002/07/owl#DatatypeProperty" ;
        rdfs:label  "minimal decoupling" .

<http://example.com/frequency>
        a           "http://www.w3.org/2002/07/owl#DatatypeProperty" ;
        rdfs:label  "frequency" .

<http://example.com/voltage>
        a           "http://www.w3.org/2002/07/owl#DatatypeProperty" ;
        rdfs:label  "Voltage" .

<http://example.com/powerConsumed>
        a           "http://www.w3.org/2002/07/owl#DatatypeProperty" ;
        rdfs:label  "power consumed" .

<http://example.com/installation>
        a           "http://www.w3.org/2002/07/owl#DatatypeProperty" ;
        rdfs:label  "installation" .

<http://example.com/Device>
        a           "http://www.w3.org/2002/07/owl#Class" ;
        rdfs:label  "device" .

<http://example.com/dimension>
        a           "http://www.w3.org/2002/07/owl#DatatypeProperty" ;
        rdfs:label  "dimension" .

<http://example.com/>
        a       "http://www.w3.org/2002/07/owl#Ontology" .

假设上面的本体存储在Jena模型ontologygraph中，我正在使用下面的代码将Jena模型作为OWL本体加载。

OWLOntology ontology = ontologyManager.
                loadOntologyFromOntologyDocument
                        (new ByteArrayInputStream(Ontology.toTurtle(ontologyGraph).getBytes()));

toturtle方法如下所示：

public static String toTurtle(Model ontologyGraph){
        StringWriter out = new StringWriter();
        ontologyGraph.write(out,"TTL");
        return out.toString();
    } 

我的问题是：

1. 为什么所有的公理都以注释的形式出现？
2. 是否可以使用OWL API直接加载Jena模型作为OWL本体，而不必通过Turtle？

Answer 1

为什么所有的公理都以注释的形式出现？

输入模型中的类型是字符串文字，但需要是IRI。比如这个：

<http://example.com/Device>
    a "http://www.w3.org/2002/07/owl#Class" ;

应该是：

<http://example.com/Device>
    a <http://www.w3.org/2002/07/owl#Class> ;

<http://example.com/Device>
    a owl:Class ;