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  1. 08-18-2009, 06:57 AM #1
    Singing Boyo
    Singing Boyo is offline Senior Member
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    Default XML Parsing, strange empty/duplicated Nodes

    I'm trying to parse XML documents, using DTD validation, but I'm coming up with #text Nodes that have a newline and tabs, and I'm getting a root node with no children, along with a root node that has children. I'm using the Xerces parser, but I could throw something together using standard java packages if it would help.

    It could be a problem with my DTD/XML file, or my source code, but I'm hoping someone can help me out. I don't really want to have to test for empty #text nodes and always have to remove the first child node.

    Also, I'm getting things like this:

    Java Code: 
    Node Name:tag
Value:null

Node Name:#text
Value:tagvalue
    and I would have expected this:
    Java Code: 
    Node Name:tag
Value:tagvalue
    So...
    My DTD (Note.dtd):
    Java Code: 
    <!ELEMENT note (to,from,heading,body)>
<!ELEMENT to (#PCDATA)>
<!ELEMENT from (#PCDATA)>
<!ELEMENT heading (#PCDATA)>
<!ELEMENT body (#PCDATA)>
    My XML file (Note.xml):
    Java Code: 
    <!DOCTYPE note SYSTEM "Note.dtd">
<!-- Taken from Brother Bear -->
<note>
	<to>Moose</to>
	<from>Moose2</from>
	<heading>I Spy Question</heading>
	<body>I spy something green</body>
</note>
    And my source code (XercesTestParser,java):
    Java Code: 
    import java.io.IOException;
import org.apache.xerces.parsers.DOMParser;
import org.w3c.dom.Document;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.xml.sax.SAXException;
import org.xml.sax.SAXNotRecognizedException;
import org.xml.sax.SAXNotSupportedException;

public class XercesTestParser {

	public static void main(String[] args){
		DOMParser parser = new DOMParser();
		try {
			parser.setFeature("http://xml.org/sax/features/validation", true);
		} catch (SAXNotRecognizedException e) {
			e.printStackTrace();
		} catch (SAXNotSupportedException e) {
			e.printStackTrace();
		}
		try {
			parser.parse("Note.xml");
		} catch (SAXException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}
		Document d = parser.getDocument();
		d.getDocumentElement();
		printNode(d,true);
	}
	private static void printNode(Node n,boolean recursive){
		NodeList nl = n.getChildNodes();
		System.out.println("Name: " + n.getNodeName());
		System.out.println("Value: " + n.getNodeValue());
		System.out.println("Parent: " + (n.getParentNode()==null?"No Parent":n.getParentNode().getNodeName()));
		System.out.println("Children: " + nl.getLength());
		System.out.println();
		if(recursive){
			for(int i=0; i<nl.getLength(); i++){
				printNode(nl.item(i),true);
			}
		}
	}
}
    Output:
    Java Code: 
    Name: #document
Value: null
Parent: No Parent
Children: 3

Name: note
Value: null
Parent: #document
Children: 0

Name: #comment
Value:  Taken from Brother Bear 
Parent: #document
Children: 0

Name: note
Value: null
Parent: #document
Children: 9

Name: #text
Value: 
	
Parent: note
Children: 0

Name: to
Value: null
Parent: note
Children: 1

Name: #text
Value: Moose
Parent: to
Children: 0

Name: #text
Value: 
	
Parent: note
Children: 0

Name: from
Value: null
Parent: note
Children: 1

Name: #text
Value: Moose2
Parent: from
Children: 0

Name: #text
Value: 
	
Parent: note
Children: 0

Name: heading
Value: null
Parent: note
Children: 1

Name: #text
Value: I Spy Question
Parent: heading
Children: 0

Name: #text
Value: 
	
Parent: note
Children: 0

Name: body
Value: null
Parent: note
Children: 1

Name: #text
Value: I spy something green
Parent: body
Children: 0

Name: #text
Value: 

Parent: note
Children: 0
    Note all the nodes like
    Name: #text
    Value:

    These I can handle with some checking, but I would prefer not to. They also disappear if I put all my XML element tags on the same line.
    Hopefully someone can tell me whether or not this can be fixed,
    Singing Boyo
    Last edited by Singing Boyo; 08-18-2009 at 07:00 AM.
    If the above doesn't make sense to you, ignore it, but remember it - might be useful!
    And if you just randomly taught yourself to program, well... you're just like me!
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