7. Write an XML file that displays book information with the following fields: Title of the book, Author Name, ISBN number, Publisher name, Edition, and Price. Define an XML schema to validate the XML document created above.

import java.io.File;

import javax.xml.XMLConstants;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;
import javax.xml.validation.Schema;
import javax.xml.validation.SchemaFactory;

import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.xml.sax.SAXParseException;
import org.xml.sax.helpers.DefaultHandler;

public class SAXValidator {
    public static void main(String[] args) {

        String xmlFilePath = "C:\\Users\\91630\\OneDrive\\Desktop\\Web_technologies_lab\\Book\\book.xml";
        String xsdFilePath = "C:\\Users\\91630\\OneDrive\\Desktop\\Web_technologies_lab\\Book\\book.xsd";

        File xmlFile = new File(xmlFilePath);
        File xsdFile = new File(xsdFilePath);

        try {

            SchemaFactory schemaFactory = SchemaFactory.newInstance(XMLConstants.W3C_XML_SCHEMA_NS_URI);
            Schema schema = schemaFactory.newSchema(xsdFile);

            SAXParserFactory saxFactory = SAXParserFactory.newInstance();
            saxFactory.setSchema(schema);

            SAXParser parser = saxFactory.newSAXParser();
            parser.parse(xmlFile, new DefaultHandler() {
                @Override
                public void error(SAXParseException e) {
                    System.out.println("Validation Error: " + e.getMessage());
                }
            });
            System.out.println("XML file is valid according to the schema.");
            DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
            DocumentBuilder builder = factory.newDocumentBuilder();
            org.w3c.dom.Document document = builder.parse(xmlFile);
            NodeList nodeList = document.getElementsByTagName("book");
            for (int i = 0; i < nodeList.getLength(); i++) {
                Node node = nodeList.item(i);
                System.out.println("Element Content: " + node.getTextContent());
            }
        } catch (Exception e) {

            System.out.println("Validation error: " + e.getMessage());
        }
    }
}

book.xml

<?xml version="1.0" encoding="UTF-8"?>
<book>
    <Name>Arun</Name>
    <Roll>506</Roll>
</book>

book.xsd

<?xml version="1.0" encoding="UTF-8"?>
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema">
    <xsd:element name="book">
        <xsd:complexType>
            <xsd:sequence>
                <xsd:element name="Name" type="xsd:string"/>
                <xsd:element name="Roll" type="xsd:integer"/>
            </xsd:sequence>
        </xsd:complexType>
    </xsd:element>
</xsd:schema>