import org.w3c.dom.*;
import javax.xml.parsers.*;
import javax.xml.transform.*;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
import javax.xml.validation.*;
import java.io.File;

public class DOMXMLValidator {
    public static void main(String[] args) {
        try {
            DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
            DocumentBuilder builder = factory.newDocumentBuilder();
            Document doc = builder.parse(new File("example.xml"));
            
            SchemaFactory schemaFactory = SchemaFactory.newInstance(XMLConstants.W3C_XML_SCHEMA_NS_URI);
            Schema schema = schemaFactory.newSchema(new File("schema.xsd"));
            Validator validator = schema.newValidator();
            validator.validate(new DOMSource(doc));
            
            System.out.println("XML is valid.");
        } catch (Exception e) {
            System.out.println("XML is not valid: " + e.getMessage());
        }
    }
}