在Java中使用OWLAPI3将曼彻斯特语法中的字符串转换为OWLAxiom对象

Question

我正在用Java编写一个利用OWL API 3.1.0版的程序。我有一个string表示一个使用曼彻斯特OWL语法的公理，我想在OWLAxiom对象中转换这个字符串，因为我需要使用Addaxiom（OWLOntology OWL,OWLAxiom axiom)方法（它是OWLontologyManager的方法）将结果公理添加到一个本体中。我怎么能那样做？

Answer 1

下面的Java代码怎么样？请注意，我解析的是一个完整但很小的本体。如果您实际上只是期望一些曼彻斯特文本不能解析为一个完整的本体，那么您可能需要在所有内容前加一些标准前缀。不过，这是特定应用程序更关心的问题。您还需要确保您得到了您感兴趣的公理类型。一定会有声明公理（例如，那个人是一个类），但您更可能对TBox和ABox公理感兴趣，因此我添加了一些关于如何获得这些公理的说明。

需要注意的一点是，如果您只是试图将公理添加到现有的本体中，这就是OWLParser方法所做的，尽管Javadoc并没有特别清楚地说明这一点（在我看来）。关于OWLParser的文档说明

owlparser将本体文档解析为本体的OWL API对象表示。

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;

import org.coode.owlapi.manchesterowlsyntax.ManchesterOWLSyntaxParserFactory;
import org.semanticweb.owlapi.apibinding.OWLManager;
import org.semanticweb.owlapi.io.OWLParser;
import org.semanticweb.owlapi.io.StreamDocumentSource;
import org.semanticweb.owlapi.model.OWLAxiom;
import org.semanticweb.owlapi.model.OWLOntology;
import org.semanticweb.owlapi.model.OWLOntologyCreationException;
import org.semanticweb.owlapi.model.OWLOntologyManager;

public class ReadManchesterString {
    public static void main(String[] args) throws OWLOntologyCreationException, IOException {
        // Get a manager and create an empty ontology, and a parser that 
        // can read Manchester syntax.
        final OWLOntologyManager manager = OWLManager.createOWLOntologyManager();
        final OWLOntology ontology = manager.createOntology();
        final OWLParser parser = new ManchesterOWLSyntaxParserFactory().createParser( manager );

        // A small OWL ontology in the Manchester syntax.
        final String content = "" +
                "Prefix: so: <http://stackoverflow.com/q/21005908/1281433/>\n" +
                "Class: so:Person\n" +
                "Class: so:Young\n" +
                "\n" +
                "Class: so:Teenager\n" +
                "  SubClassOf: (so:Person and so:Young)\n" +
                "";

        // Create an input stream from the ontology, and use the parser to read its 
        // contents into the ontology.
        try ( final InputStream in = new ByteArrayInputStream( content.getBytes() ) ) {
            parser.parse( new StreamDocumentSource( in ), ontology );
        }

        // Iterate over the axioms of the ontology. There are more than just the subclass
        // axiom, because the class declarations are also axioms.  All in all, there are
        // four:  the subclass axiom and three declarations of named classes.
        System.out.println( "== All Axioms: ==" );
        for ( final OWLAxiom axiom : ontology.getAxioms() ) {
            System.out.println( axiom );
        }

        // You can iterate over more specific axiom types, though.  For instance, 
        // you could just iterate over the TBox axioms, in which case you'll just
        // get the one subclass axiom. You could also iterate over
        // ontology.getABoxAxioms() to get ABox axioms.
        System.out.println( "== ABox Axioms: ==" );
        for ( final OWLAxiom axiom : ontology.getTBoxAxioms( false ) ) {
            System.out.println( axiom );
        }
    }
}

输出为：

== All Axioms: ==
SubClassOf(<http://stackoverflow.com/q/21005908/1281433/Teenager> ObjectIntersectionOf(<http://stackoverflow.com/q/21005908/1281433/Person> <http://stackoverflow.com/q/21005908/1281433/Young>))
Declaration(Class(<http://stackoverflow.com/q/21005908/1281433/Person>))
Declaration(Class(<http://stackoverflow.com/q/21005908/1281433/Young>))
Declaration(Class(<http://stackoverflow.com/q/21005908/1281433/Teenager>))
== ABox Axioms: ==
SubClassOf(<http://stackoverflow.com/q/21005908/1281433/Teenager> ObjectIntersectionOf(<http://stackoverflow.com/q/21005908/1281433/Person> <http://stackoverflow.com/q/21005908/1281433/Young>))