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[英]File/ontology (turtle, N3, JSON, RDF-XML) etc to .ttl file conversions in java
[英]RDF/XML Ontology: Convert into JSON(-LD) Tree in Java
我正在嘗試處理以Protégé創建的RDF / XML格式存儲的現有本體(OWL 2.0),以Java中的JSON / JSON-LD樹表示形式。 目標是在單獨的vue.js Web應用程序中使用此處理后的數據進行可視化。
不幸的是,我正在努力做到這一點。
這是我要處理的本體(示例本體):
<?xml version="1.0"?>
<rdf:RDF xmlns="urn:absolute:example.com/"
xml:base="urn:absolute:example.com/"
xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
xmlns:owl="http://www.w3.org/2002/07/owl#"
xmlns:xml="http://www.w3.org/XML/1998/namespace"
xmlns:xsd="http://www.w3.org/2001/XMLSchema#"
xmlns:rdfs="http://www.w3.org/2000/01/rdf-schema#">
<owl:Ontology rdf:about="urn:absolute:example.com/"/>
<!--
///////////////////////////////////////////////////////////////////////////////////////
//
// Classes
//
///////////////////////////////////////////////////////////////////////////////////////
-->
<!-- urn:absolute:example.com/#CPU -->
<owl:Class rdf:about="urn:absolute:example.com/#CPU">
<rdfs:subClassOf rdf:resource="urn:absolute:example.com/#Hardware"/>
</owl:Class>
<!-- urn:absolute:example.com/#Enduser_Application -->
<owl:Class rdf:about="urn:absolute:example.com/#Enduser_Application">
<rdfs:subClassOf rdf:resource="urn:absolute:example.com/#Software"/>
</owl:Class>
<!-- urn:absolute:example.com/#GPU -->
<owl:Class rdf:about="urn:absolute:example.com/#GPU">
<rdfs:subClassOf rdf:resource="urn:absolute:example.com/#Hardware"/>
</owl:Class>
<!-- urn:absolute:example.com/#HDD -->
<owl:Class rdf:about="urn:absolute:example.com/#HDD">
<rdfs:subClassOf rdf:resource="urn:absolute:example.com/#Storage"/>
</owl:Class>
<!-- urn:absolute:example.com/#Hardware -->
<owl:Class rdf:about="urn:absolute:example.com/#Hardware"/>
<!-- urn:absolute:example.com/#Keyboard -->
<owl:Class rdf:about="urn:absolute:example.com/#Keyboard">
<rdfs:subClassOf rdf:resource="urn:absolute:example.com/#Peripherals"/>
</owl:Class>
<!-- urn:absolute:example.com/#Mainboard -->
<owl:Class rdf:about="urn:absolute:example.com/#Mainboard">
<rdfs:subClassOf rdf:resource="urn:absolute:example.com/#Hardware"/>
</owl:Class>
<!-- urn:absolute:example.com/#Monitor -->
<owl:Class rdf:about="urn:absolute:example.com/#Monitor">
<rdfs:subClassOf rdf:resource="urn:absolute:example.com/#Peripherals"/>
</owl:Class>
<!-- urn:absolute:example.com/#Mouse -->
<owl:Class rdf:about="urn:absolute:example.com/#Mouse">
<rdfs:subClassOf rdf:resource="urn:absolute:example.com/#Peripherals"/>
</owl:Class>
<!-- urn:absolute:example.com/#Operating_System -->
<owl:Class rdf:about="urn:absolute:example.com/#Operating_System">
<rdfs:subClassOf rdf:resource="urn:absolute:example.com/#Software"/>
</owl:Class>
<!-- urn:absolute:example.com/#Peripherals -->
<owl:Class rdf:about="urn:absolute:example.com/#Peripherals">
<rdfs:subClassOf rdf:resource="urn:absolute:example.com/#Hardware"/>
</owl:Class>
<!-- urn:absolute:example.com/#Printer -->
<owl:Class rdf:about="urn:absolute:example.com/#Printer">
<rdfs:subClassOf rdf:resource="urn:absolute:example.com/#Peripherals"/>
</owl:Class>
<!-- urn:absolute:example.com/#SSD -->
<owl:Class rdf:about="urn:absolute:example.com/#SSD">
<rdfs:subClassOf rdf:resource="urn:absolute:example.com/#Storage"/>
</owl:Class>
<!-- urn:absolute:example.com/#Software -->
<owl:Class rdf:about="urn:absolute:example.com/#Software"/>
<!-- urn:absolute:example.com/#Storage -->
<owl:Class rdf:about="urn:absolute:example.com/#Storage">
<rdfs:subClassOf rdf:resource="urn:absolute:example.com/#Hardware"/>
</owl:Class>
<!-- urn:absolute:example.com/#Video_Game -->
<owl:Class rdf:about="urn:absolute:example.com/#Video_Game">
<rdfs:subClassOf rdf:resource="urn:absolute:example.com/#Enduser_Application"/>
</owl:Class>
<!-- urn:absolute:example.com/#Word_Processor -->
<owl:Class rdf:about="urn:absolute:example.com/#Word_Processor">
<rdfs:subClassOf rdf:resource="urn:absolute:example.com/#Enduser_Application"/>
</owl:Class>
</rdf:RDF>
<!-- Generated by the OWL API (version 4.2.8.20170104-2310) https://github.com/owlcs/owlapi -->
這是我想將此本體轉換成的結構(最好是在JSON或JSON-LD中):
Thing
|-- Hardware
|-- CPU
|-- GPU
|-- Mainboard
|-- Peripherals
|-- Keyboard
|-- Monitor
|-- Mouse
|-- Printer
|-- Storage
|-- HDD
|-- SSD
|-- Software
|-- Enduser_Application
|-- Video_Game
|-- Word_Processor
|-- Operating_System
但是,本體通過其subclassOf屬性定義了類之間完全相反的關系。 因此,事情似乎變得更加困難。
我已經嘗試了幾種不同的方法。
使用Apache Jena
Model model = ModelFactory.createOntologyModel(); model.read(ontology, "OWL"); model.write(new BufferedWriter(f), "JSON-LD");
目前,這似乎工作“最佳”。 我最終得到一個以樹表示形式包含JSON-LD數據的字符串。 但是,類關系是相反的:
例如,頂層由元素Keyboard,Monitor,Mouse,Printer等組成。 它們各自的超類作為子元素附加。
如果有一種使用Apache Jena來逆轉關系的方法,那將非常酷。 我目前無法想到一種可能的方式。
使用owlapi
由於某種原因,owlapi對我完全不起作用。 它一直無法解析我的本體。
使用JSON-LD框架(使用方法1的輸出)
我注意到JSON-LD具有所謂的“成幀”功能,該功能實質上允許您將數據重新適配到已定義的框架中。
我修改了JSON-LD的@reverse
關鍵字以及rdfs:subclassOf
希望從本質上扭轉這種關系。 但是,我也無法使它正常工作,而且我對JSON-LD也不完全了解。 因此,我有些掙扎。
這已經給我帶來了一些不眠之夜。 如果有人知道解決方案,或者可以給我提示如何解決此問題,我將非常高興。
非常非常感謝。
我檢查了一下,確實可以使用OWL API加載您的本體並將其保存為JsonLD格式。 不過,正如@Ignazio指出的那樣,我懷疑它能否解決您的問題。 為了打印出樹形結構,您需要訪問一個推理器,從中可以查詢包含關系。
這是一個代碼示例,用於加載和保存本體並將其打印為樹形結構。
private static Logger logger = LoggerFactory
.getLogger(owl.api.test.StandaloneOWLNamedIndividualRetrievalv5.AppHardwareTest.class);
// Why This Failure marker
private static final Marker WTF_MARKER = MarkerFactory.getMarker("WTF");
static OWLReasoner reasoner;
static void printChildren(NodeSet<OWLClass> owlClasses) {
for (Node<OWLClass> node : owlClasses) {
logger.trace(node.getRepresentativeElement().toString());
if (!node.getRepresentativeElement().isBottomEntity())
printChildren(reasoner.getSubClasses(node.getRepresentativeElement()));
}
}
public static void main(String[] args) {
try {
// Setup physical IRI for storing ontology
Path path = Paths.get(".").toAbsolutePath().normalize();
IRI loadDocumentIRI = IRI.create("file:" + path.toFile().getAbsolutePath() + "/hardware.owl");
IRI saveDocumentIRI = IRI.create("file:" + path.toFile().getAbsolutePath() + "/hardwareSave.txt");
// Initialize
OWLOntologyManager manager = OWLManager.createOWLOntologyManager();
OWLOntology ontology = manager.loadOntologyFromOntologyDocument(loadDocumentIRI);
// Write to JsonLD format
OWLDocumentFormat ontologyFormat = new RDFJsonLDDocumentFormat();
manager.saveOntology(ontology, ontologyFormat, saveDocumentIRI);
// Print tree structure
OWLReasonerFactory reasonerFactory = new JFactFactory();
reasoner = reasonerFactory.createReasoner(ontology);
Node<OWLClass> top = reasoner.getTopClassNode();
logger.trace(top.getRepresentativeElement().toString());
printChildren(reasoner.getSubClasses(top.getRepresentativeElement()));
} catch (Throwable t) {
logger.error(WTF_MARKER, t.getMessage(), t);
}
}
希望對您有所幫助。 祝好運。
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