createProcessingInstruction problem

[Jens Sander <Ye...@ePost.de>]

Hi !

I'v got a problem. I tried to modify the DOMGenerate.java sample
included in the xerces tar.gz.
I just wanted to add a single line concerning a processingInstruction.
Everywhere I looked for some more Information I found the
createProcessingInformation
method to be invoked on the document itself. But when running the
program the
output doesn't show the new ProcessingInstruction - line. I tried to
append this PI to
root. It worked. So why can't I append the PI to the document itself ?

So, have a look at the sourcecode :


>import  org.w3c.dom.*;
>import  org.apache.xerces.dom.DocumentImpl;
>import  org.apache.xerces.dom.DOMImplementationImpl;
>import  org.w3c.dom.Document;
>import  org.apache.xml.serialize.OutputFormat;
>import  org.apache.xml.serialize.Serializer;
>import  org.apache.xml.serialize.SerializerFactory;
>import  org.apache.xml.serialize.XMLSerializer;
>import  java.io.*;

>public class DOMGenerate {
>   public static void main( String[] argv) {
>        try {
>            Document doc= new DocumentImpl();
>            doc.appendChild(doc.createProcessingInstruction("target",
"data"));
>^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
>            Element root = doc.createElement("person");     // Create
Root Element
>            Element item = doc.createElement("name");       // Create
element
>            item.appendChild( doc.createTextNode("YenZi") );
>            root.appendChild( item );                       // atach
element to Root element
>            item = doc.createElement("age");                // Create
another Element
>            item.appendChild( doc.createTextNode("28" ) );
>            root.appendChild( item );                       // Attach
Element to previous element down tree
>            item = doc.createElement("height");
>            item.appendChild( doc.createTextNode("1.80" ) );
>            root.appendChild( item );                       // Attach
another Element - grandaugther
>            doc.appendChild( root );                        // Add Root
to Document
>
>     Node node = doc.getFirstChild();
>
>     PrintWriter out = res.getWriter();
>            OutputFormat    format  = new OutputFormat( doc );
//Serialize DOM
>            StringWriter  stringOut = new StringWriter();
//Writer will be a String
>            XMLSerializer    serial = new XMLSerializer( stringOut,
format );
>            serial.asDOMSerializer();                            // As
a DOM Serializer
>     // doku
>            serial.serialize( doc.getDocumentElement() );
>
>            out.println( "STRXML = " + stringOut.toString() ); //Spit
out DOM as a String
>        } catch ( Exception ex ) {
>            ex.printStackTrace();
>        }
>    }
>}


Can somebody help me with this problem ?
Im using Xerces-J-1.1.3 and SUN JDK1.2.2 under Debian Linux 2.2
(potato).

Thanx, YenZi