How to query an ordinary xml

Question

I have an xml and I want to query for a particular sub element within it. I can't find any help on this in any of the documentation. All I find is the getVariableData but it can only query on xml that is defined to have part names. How to query on an ordinary xml that doesn't have any part defined? For example I want to query for USERNAME in the xml:
<ServiceBean_Header simpleType="false">
<USERNAME>SYSADMIN</USERNAME>
<PASSWORD>SYSADMIN</PASSWORD>
<RESPONSIBILITY_NAME>System Administrator</RESPONSIBILITY_NAME>
<RESPONSIBILITY_APPL_NAME>SYSADMIN</RESPONSIBILITY_APPL_NAME>
<SECURITY_GROUP_NAME>STANDARD</SECURITY_GROUP_NAME>
<NLS_LANGUAGE>AMERICAN</NLS_LANGUAGE>
</ServiceBean_Header>

Answer 1

If the DOM you have was produced using the Oracle XML Developers Kit (XDK) then you can issue XPath statements against it using "selectSingleNode" and "selectNodes".
import java.io.FileReader;
import oracle.xml.parser.v2.DOMParser;
import oracle.xml.parser.v2.XMLDocument;
import org.w3c.dom.Node;
public class Test {
    public static void main(String[] args) throws Exception {
      FileReader reader = new FileReader("YOUR_XML.xml");
      DOMParser parser = new DOMParser();
      parser.parse(reader);
      XMLDocument xmlDocument = parser.getDocument();
      Node resultNode = xmlDocument.selectSingleNode("ServiceBean_Header/USERNAME/text()");
      System.out.println(resultNode.getNodeValue());
}-Blaise