Aelfed parser - Input Source Problem???

Question

Hi all, i'm fairly new to all this so excuse my basic knowledge. I am incurring a really annoying problem which is preventing me from continuing working. Basically, using the following code, when I excecute the program, specifying a 'Stocks.xml' file, it returns the following error,
'Error: no protocol: Stocks.dtd"
The 'Stocks.dtd' resides in the same directory as 'Stocks.xml' and is formatted correctly.
Does anyone have any suggestions as to what could be causing this problem????
import org.xml.sax.*;
import org.xml.sax.helpers.*;
import java.io.*;
public class SAXApp {
     public static void main (String args[]) throws Exception {
          // Set the Parser: IBM XML Parser or AElfred
          String parserClass = "com.microstar.xml.SAXDriver";
          // String parserClass = "com.ibm.xml.parser.SAXDriver";
          // Create Parser Object using ParserFactory
          Parser parser = ParserFactory.makeParser (parserClass);
          // Set Parser Document Handler
          myHandler handler = new myHandler ();
          parser.setDocumentHandler (handler);
          // Create FileReader, then Input Source
          FileReader filereader = new FileReader (args[0]);
          BufferedReader bufreader = new BufferedReader (filereader);
          InputSource insource = new InputSource (bufreader);
          // InputSource insource = new InputSource (filereader);
          // Start Parsing
          try {
          parser.parse (insource);
          catch (SAXException e) {
          System.out.println("Error: "+e.getMessage());
// Event Handler
class myHandler extends HandlerBase {
     // Constructor
     public myHandler () {
     public void characters
     (char ch[], int start, int length) {
          String text = new String (ch, start, length);
          System.out.println("Character data: "+text);
     public void startElement
     (String name, AttributeList atts) {
          System.out.println ("Start Element: "+name);
     public void endElement (String name) {
          System.out.println ("End Element: "+name);
}

Answer 1

I seem to have come across a way to over come this problem,
Instead of using the following,
FileReader filereader = new FileReader (args[0]);
BufferedReader bufreader = new BufferedReader (filereader);
InputSource insource = new InputSource (bufreader);
parser.parse (insource);
If I just use,
parser.parser(args[0]);
It works... only using the URL starting with "file:///"
...can anyone shed any light on this.
Cheers in advance!