Problem with validating with xerces

Question

Hi,
I just would like to put in practice my recent knowledge about XML Schema. I choose Xerces for this.
Unforunately, when I execute my code, I receive the following error message, and I absolutely don't understand why.
I'm sure that XML document and XML schema are valide, and there's any mention of any doctype in my XML instance:
Error message:
Root element of document "Bookstore" must correspond to root DOCTYPE 'null'
document isn't valid because grammary isn't reachable.
And Here's my very simple java class to perform validation:
import org.apache.xerces.parsers.SAXParser;
import java.io.IOException;
import java.io.FileReader;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.DefaultHandler;
import org.xml.sax.SAXNotRecognizedException;
import org.xml.sax.SAXNotSupportedException;
import org.xml.sax.InputSource;
public class SAXParserDemo extends DefaultHandler {
     private static String featureURI="";
     public static void main(String argv[]) throws IOException {
InputSource inputSource = new InputSource(new FileReader("BookStore.xml"));
     featureURI = "http://xml.org/sax/features/validation";     
SAXParser parser = new SAXParser();
parser.setContentHandler(new SAXParserContentHandler());
parser.setErrorHandler(new SAXParserErrorHandler());
     try {
     parser.setFeature(featureURI, true);
     } catch (SAXNotRecognizedException e)
     System.out.println("La classe de l'analyseur ne reconna?t pas l'URI d'option" + featureURI);
     System.exit(0);
catch (SAXNotSupportedException e) {
System.out.println("La classe de l'analyseur ne prend pas en charge l'URI d'option " + featureURI);
     System.exit(0);
          try {
parser.parse(inputSource);
} catch (IOException e) {
System.out.println("Can't read the file.");     
} catch (SAXException e) {
System.out.println("Parsing error.");
Has anybody any idea to fix that?
I guess there's perhaps a problem when defining InputSource, I have to define a systemId or something of this kind, no?
I would be very grateful..
Thanks in advance,
S.

Answer 1

Thanks for your response.
The problem is that ANY doctype is specified in my input xml document, but only a schema location, like this:
<?xml version="1.0"?>
<BookStore xmlns="http://www.books.org"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation=
"http://www.books.org
BookStore.xsd">
<Book>
<Title>My Life and Times</Title>
<Author>Paul McCartney</Author>
<Date>1998</Date>
<ISBN>1-56592-235-2</ISBN>
<Publisher>McMillin Publishing</Publisher>
</Book>
<Book>
<Title>Illusions The Adventures of a Reluctant Messiah</Title>
<Author>Richard Bach</Author>
<Date>1977</Date>
<ISBN>0-440-34319-4</ISBN>
<Publisher>Dell Publishing Co.</Publisher>
</Book>
<Book>
<Title>The First and Last Freedom</Title>
<Author>J. Krishnamurti</Author>
<Date>1954</Date>
<ISBN>0-06-064831-7</ISBN>
<Publisher>Harper & Row</Publisher>
</Book>
</BookStore>
That's why I don't understand why the error message tells about a doctype. Should I have to specify somewhewe i want to validate against a XML Schema and no againt a DTD?
Thanks again for your help,
Anyway, I will have a look in the xerces' documenatation,
Steevy.