Java – XPath multi tag selection

For a given XML, how do I use XPath to select C, D, G, H (this will be a child tag in B that is not j)?

XML

<a>
 <b>
  <c>select me</c>
  <d>select me</d>
  <e>do not select me</e>
  <f>
    <g>select me</g>
    <h>select me</h>
  </f>
 </b>

 <j>
  <c>select me</c>
  <d>select me</d>
  <e>do not select me</e>
  <f>
    <g>select me</g>
    <h>select me</h>
  </f>
 </j>
</a>

I want to use the following to get the result, but it doesn't give me g, H values

xpath.compile("//a/b/*[self::c or self::d or self::f/text()");

The Java code I use

import org.w3c.dom.*;
import javax.xml.xpath.*;
import javax.xml.parsers.*;
import java.io.IOException;
import org.xml.sax.SAXException;

 public class XPathDemo {

   public static void main(String[] args) 
   throws ParserConfigurationException,SAXException,IOException,PathExpressionException {

   DocumentBuilderFactory domFactory = 
   DocumentBuilderFactory.newInstance();
   domFactory.setNamespaceAware(true); 
   DocumentBuilder builder = domFactory.newDocumentBuilder();
   Document doc = builder.parse("test.xml");
   XPath xpath = XPathFactory.newInstance().newXPath();

   XPathExpression expr = xpath.compile("//a/b/*[self::c or self::d or self::f]/text()");

  Object result = expr.evaluate(doc,XPathConstants.NODESET);
  NodeList nodes = (NodeList) result;
    for (int i = 0; i < nodes.getLength(); i++) {
        System.out.println(nodes.item(i).getNodeValue()); 
   }
}

}

Who can help me with this?

Thank you.

Solution

use:

//a/b/*[not(self::e or self::f)]
|
 //a/b/*/*[self::g or self::h]

If you have a good understanding of the structure of an XML document and / / the only descendants a / B can have are g and / or h, this can be simplified as:

//a/b/*[not(self::e or self::f)]
|
 //a/b/*/*

In XPath 2.0, this can be written more simply:

//a/b/(*[not(self::e or self::f)] | */*)