e-Science e-Business e-Government and their Technologies

Homework 5

Part I: XML and Java

• Write a Java program that uses Xerces to read and validate an XML document, and to construct a DOM for the document (you may follow examples given in the lectures).
• Assuming that the input document follows the DTD you devised in homework 4, extend your Java program to print out some selected data from the document. Try to extract a few important kinds of information from your document, and print them out in a pleasantly readable fashion.
• HINTS:
  • You may if you wish adapt the DOM processing code given in the lectures (see here). But you should be selective in what information you extract. For example removing the line System.out.println(node.getNodeName()) and replacing the unconditional System.out.println(node.getNodeValue()) with:

             if(node.getNodeType() == Node.TEXT_NODE &&
                node.getParentNode().getNodeName().equals("degree")) {
                 System.out.println(node.getNodeValue()) ;
             }
    

    would print only text from inside elements of type degree. Generally a single process() method could extract a few kinds of information, or a few different process()-like methods could be called one after the other to extract different kinds of information.
• For grading, submit your Java program, together with input XML document with DTD (the XML and DTD may be the same as you submitted in Homework 4).
• Mail your code to Bryan Carpenter with a due date of Sunday March 28. If you need clarification, or encounter any significant problems please contact me!

Part II: Web Services Background Reading