I am trying to extract attributes of elements and failing.
In the example below I want to extract the value("Kg") of the "units"
attribute of the element weight.

My code is based on "XML Cookbook" by Ian F Darwin, OReilly.
21.4 Parsing XML with DOM.

-------------------- animals.xml ------------------------
<inventory>
  <animal type="mammal">
    <name>Fred</name>
    <species>Hippo</species>
    <weight units="Kg">1552</weight>
  </animal>
  <animal type="reptile">
    <name>Gert</name>
    <species>Croc</species>
  </animal>
</inventory>
-------------------- ParseXML.java -----------------------
import java.io.File;
import java.io.IOException;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;

import org.w3c.dom.Document;
import org.w3c.dom.NamedNodeMap;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.xml.sax.SAXException;

public class ParseXML {

    public static void main(String[] args) {

        String filename = "XML/animals.xml";

        String uri = "file:" + new File(filename).getAbsolutePath();
        Document doc = null;
        try {
            DocumentBuilderFactory factory = DocumentBuilderFactory
                    .newInstance();
            DocumentBuilder builder = factory.newDocumentBuilder();
            doc = builder.parse(uri);
        } catch (ParserConfigurationException e) {
            e.printStackTrace();
        } catch (SAXException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
        doRecursive(doc, "");
    } // main

    private static void doRecursive(Node node, String name) {
        if (node == null)
            return;
        NodeList nodes = node.getChildNodes();
        for (int i = 0; i < nodes.getLength(); i++) {
            Node n = nodes.item(i);
            if (n == null)
                continue;
            doNode(n, name);
        }
    }

    private static void doNode(Node node, String name) {
        String nodeName = "unknown";
        switch (node.getNodeType()) {
        case Node.ELEMENT_NODE:
            if (name.length() == 0) {
                nodeName = node.getNodeName();
            } else {
                nodeName = name + "." + node.getNodeName();
            }
            doRecursive(node, nodeName);
            break;
        case Node.TEXT_NODE:
            String text = node.getNodeValue();
            if (text.length() == 0 || text.matches("\n *")
                    || text.equals("\\r")) {
                break;
            }

            // I seem to be on the wrong track here!
            String type = "";
            NamedNodeMap attrs = node.getAttributes();
            if (attrs != null) {
                Node attr = attrs.getNamedItem("type");
                if (attr != null) {
                    type = attr.getNodeValue();
                }
            }

            System.out.println(name + "(" + type + ") = '"
                                    + text + "'.");
            nodeName = "unknown";
            break;
        default:
            System.out.println("Other node " + node.getNodeType()
                    + " : " + node.getClass());
            break;
        }
    } // doNode()

}
------------------------------ actual output ------------------
inventory.animal.name() = 'Fred'.
inventory.animal.species() = 'Hippo'.
inventory.animal.weight() = '1552'.
inventory.animal.name() = 'Gert'.
inventory.animal.species() = 'Croc'.
-------------------------------- desired output ---------------
inventory.animal.name() = 'Fred'.
inventory.animal.species() = 'Hippo'.
inventory.animal.weight(Kg) = '1552'.
inventory.animal.name() = 'Gert'.
inventory.animal.species() = 'Croc'.
---------------------------------------------------------------

Clues?