public static String generateXPath(XmlCursor node,
    XmlCursor context,
    NamespaceContext nsctx) throws XPathGenerationException 
{
        if (node == null)
            throw new IllegalArgumentException("Null node");
        if (nsctx == null)
            throw new IllegalArgumentException("Null namespace context");
        TokenType tt = node.currentTokenType();
        if (context != null && node.isAtSamePositionAs(context))
            return ".";
        switch (tt.intValue())
        {
            case TokenType.INT_ATTR:
                QName name = node.getName();
                node.toParent();
                String pathToParent = generateInternal(node, context, nsctx);
                return pathToParent + '/' + '@' + qnameToString(name, nsctx);
            case TokenType.INT_NAMESPACE:
                name = node.getName();
                node.toParent();
                pathToParent = generateInternal(node, context, nsctx);
                String prefix = name.getLocalPart();
                if (prefix.length() == 0)
                    return pathToParent + "/@xmlns";
                else
                    return pathToParent + "/@xmlns:" + prefix;
            case TokenType.INT_START:
            case TokenType.INT_STARTDOC:
                return generateInternal(node, context, nsctx);
            case TokenType.INT_TEXT:
                int nrOfTextTokens = countTextTokens(node);
                node.toParent();
                pathToParent = generateInternal(node, context, nsctx);
                if (nrOfTextTokens == 0)
                    return pathToParent + "/text()";
                else
                    return pathToParent + "/text()[position()=" + nrOfTextTokens + ']';
            default:
                throw new XPathGenerationException("Cannot generate XPath for cursor position: " +
                    tt.toString());
        }
}

Generates an XPath pointing to the position in the document indicated by node.

If the context parameter is null, the XPath is absolute, otherwise the XPath will be relative to the position indicated by context.

Note: the cursor position for the node parameter is not preserved

 public static  void main(String[] args) throws XmlException 
{
        String xml =
            "< root >\n" +
                "< ns:a xmlns:ns=\"http://a.com\" >< b foo=\"value\" >text1< c/ >text2< c/ >text3< c >text< /c >text4< /b >< /ns:a >\n" +
                "< /root >";
        NamespaceContext ns = new NamespaceContext() {
            public String getNamespaceURI(String prefix)
            {
                if ("ns".equals(prefix))
                    return "http://a.com";
                else
                    return null;
            }
            public String getPrefix(String namespaceUri)
            {
                return null;
            }
            public java.util.Iterator getPrefixes(String namespaceUri)
            {
                return null;
            }
        };
        XmlCursor c = org.apache.xmlbeans.XmlObject.Factory.parse(xml).newCursor();
        c.toFirstContentToken(); // on < root >
        c.toFirstContentToken(); // on < a >
        c.toFirstChild();        // on < b >
        c.toFirstChild();        // on < c >
        c.push(); System.out.println(generateXPath(c, null, ns)); c.pop();
        c.toNextSibling();
        c.toNextSibling();       // on the last < c >
        c.push(); System.out.println(generateXPath(c, null, ns)); c.pop();
        XmlCursor d = c.newCursor();
        d.toParent();
        c.push(); System.out.println(generateXPath(c, d, ns)); c.pop();
        d.toParent();
        c.push(); System.out.println(generateXPath(c, d, ns)); c.pop();
        c.toFirstContentToken(); // on text content of the last < c >
        c.push(); System.out.println(generateXPath(c, d, ns)); c.pop();
        c.toParent();
        c.toPrevToken();         // on text content before the last < c >
        c.push(); System.out.println(generateXPath(c, d, ns)); c.pop();
        c.toParent();            // on < b >
        c.push(); System.out.println(generateXPath(c, d, ns)); c.pop();
        c.toFirstAttribute();    // on the "foo" attribute
        c.push(); System.out.println(generateXPath(c, d, ns)); c.pop();
        c.toParent();
        c.toParent();
        c.toNextToken();         // on the "xmlns:ns" attribute
        c.push(); System.out.println(generateXPath(c, d, ns)); c.pop();
        c.push(); System.out.println(generateXPath(c, null, ns)); c.pop();
}