I want to know How to parse the file in OWL/XML syntax - semantic-web

Question

I don't know how to parse this file, can someone tell me how to parse it?
The file is on the below. I have tried to find the way to parse for about 3 days.
<?xml version="1.0"?>
<!DOCTYPE Ontology [
<!ENTITY owl "http://www.w3.org/2002/07/owl#" >
<!ENTITY xsd "http://www.w3.org/2001/XMLSchema#" >
<!ENTITY owl2xml "http://www.w3.org/2006/12/owl2-xml#" >
<!ENTITY rdfs "http://www.w3.org/2000/01/rdf-schema#" >
<!ENTITY ontology_people1 "http://www.okkam.org/ontology_people1.owl#" >
<!ENTITY rdf "http://www.w3.org/1999/02/22-rdf-syntax-ns#" >
]>
<Ontology xmlns="http://www.w3.org/2006/12/owl2-xml#"
xml:base="http://www.w3.org/2006/12/owl2-xml#"
xmlns:rdfs="http://www.w3.org/2000/01/rdf-schema#"
xmlns:owl2xml="http://www.w3.org/2006/12/owl2-xml#"
xmlns:owl="http://www.w3.org/2002/07/owl#"
xmlns:xsd="http://www.w3.org/2001/XMLSchema#"
xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
xmlns:ontology_people1="http://www.okkam.org/ontology_people1.owl#"
URI="http://www.okkam.org/ontology_people1.owl">
<SubClassOf>
<Class URI="&ontology_people1;Address"/>
<Class URI="&ontology_people1;Location"/>
</SubClassOf>
<Declaration>
<Class URI="&ontology_people1;Address"/>
</Declaration>
......
</Ontology>
<!-- Generated by the OWL API (version 2.2.1.1138) http://owlapi.sourceforge.net -->

Answer 1

This can be parsed with the default parsers loaded by OWLAPI.
This should be enough:
import java.io.File;
import org.semanticweb.owlapi.apibinding.OWLManager;
import org.semanticweb.owlapi.model.OWLOntology;
import org.semanticweb.owlapi.model.OWLOntologyCreationException;
import org.semanticweb.owlapi.model.OWLOntologyManager;
public class Check {
public static void main(String[] args) throws OWLOntologyCreationException {
OWLOntologyManager manager=OWLManager.createOWLOntologyManager();
OWLOntology o=manager.loadOntologyFromOntologyDocument(new File("filename.xml"));
}
}

Answer 2

Don't get frustrated. I think you are looking for an xml parser. Which language are you using? There are already many xml parser implemented by other people. Here is an example using Java: https://www.mkyong.com/java/how-to-read-xml-file-in-java-dom-parser/