import javax.xml.XMLConstants;
import javax.xml.validation.*;
import javax.xml.transform.sax.SAXSource;
import org.xml.sax.*;
import java.io.*;

public class Validate {
    public static void main(String[] args) throws IOException {
	File documentFile = new File(args[0]);  // 1st arg is document
	File schemaFile = new File(args[1]);    // 2nd arg is schema 

	// Get a parser to parse W3C schemas.  Note use of javax.xml package
	// This package contains just one class of constants.
	SchemaFactory factory =
	    SchemaFactory.newInstance(XMLConstants.W3C_XML_SCHEMA_NS_URI);
	
	// Now parse the schema file to create a Schema object
	Schema schema = null;
	try { schema = factory.newSchema(schemaFile); }
	catch(SAXException e) { fail(e); }

	// Get a Validator object from the Schema.
	Validator validator = schema.newValidator();

	// Get a SAXSource object for the document
	// We could use a DOMSource here as well
	SAXSource source =
	    new SAXSource(new InputSource(new FileReader(documentFile)));
	
	// Now validate the document
	try { validator.validate(source); }
	catch(SAXException e) { fail(e); }

	System.err.println("Document is valid");
    }

    static void fail(SAXException e) {
	if (e instanceof SAXParseException) {
	    SAXParseException spe = (SAXParseException) e;
	    System.err.printf("%s:%d:%d: %s%n",
			      spe.getSystemId(), spe.getLineNumber(),
			      spe.getColumnNumber(), spe.getMessage());
	}
	else {
	    System.err.println(e.getMessage());
	}
	System.exit(1);
    }
}