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Some handy utility methods for XPath:

import com.collaxa.cube.xml.xpath.SimpleNamespaceContext;
import java.util.*;
import javax.xml.namespace.NamespaceContext;
import javax.xml.xpath.*;
import oracle.bpel.services.common.util.XMLUtil;
import oracle.tip.pc.infra.exception.PCException;

import oracle.xml.xpath.JXPathFactory;
import org.w3c.dom.*;

    public class XPathUtils
{

    public XPathUtils()
    {
    }

    public static NodeList selectNodes(Element pElement, String xpathExpression)
        throws Exception
    {
        XPath xPath = createXPath();
        Document doc = null;
        if(pElement instanceof Document)
            doc = (Document)pElement;
        else
            doc = pElement != null ? pElement.getOwnerDocument() : null;
        NodeList value = (NodeList)xPath.evaluate(xpathExpression, doc, XPathConstants.NODESET);
        return value;
    }

    public static NodeList selectNodes(Element pElement, String xpathExpression, Map prefixNamespaceMapping)
        throws Exception
    {
        XPath xPath = createXPath(prefixNamespaceMapping);
        Document doc = null;
        if(pElement instanceof Document)
            doc = (Document)pElement;
        else
            doc = pElement != null ? pElement.getOwnerDocument() : null;
        NodeList value = (NodeList)xPath.evaluate(xpathExpression, doc, XPathConstants.NODESET);
        return value;
    }

    public static NodeList selectNodes(Element pElement, String xpathExpression, NamespaceContext namespaceContext)
        throws Exception
    {
        XPath xPath = createXPath(namespaceContext);
        Document doc = null;
        if(pElement instanceof Document)
            doc = (Document)pElement;
        else
            doc = pElement != null ? pElement.getOwnerDocument() : null;
        NodeList value = (NodeList)xPath.evaluate(xpathExpression, doc, XPathConstants.NODESET);
        return value;
    }

    public static Object evaluate(Element pElement, String xpathExpression)
        throws Exception
    {
        XPath xPath = createXPath();
        Document doc = null;
        if(pElement instanceof Document)
            doc = (Document)pElement;
        else
            doc = pElement != null ? pElement.getOwnerDocument() : null;
        Object value = xPath.evaluate(xpathExpression, doc, XPathConstants.NODESET);
        return value;
    }

    public static Object evaluate(Element pElement, String xpathExpression, Map prefixNamespaceMapping)
        throws Exception
    {
        XPath xPath = createXPath(prefixNamespaceMapping);
        Document doc = null;
        if(pElement instanceof Document)
            doc = (Document)pElement;
        else
            doc = pElement != null ? pElement.getOwnerDocument() : null;
        Object value = xPath.evaluate(xpathExpression, doc, XPathConstants.NODESET);
        return value;
    }

    public static Object selectSingleNode(Element pElement, String xpathExpression)
        throws Exception
    {
        XPath xPath = createXPath();
        Document doc = null;
        if(pElement instanceof Document)
            doc = (Document)pElement;
        else
            doc = pElement != null ? pElement.getOwnerDocument() : null;
        Node value = (Node)xPath.evaluate(xpathExpression, doc, XPathConstants.NODE);
        return value;
    }

    public static Object selectSingleNode(Element pElement, String xpathExpression, Map prefixNamespaceMapping)
        throws Exception
    {
        XPath xPath = createXPath(prefixNamespaceMapping);
        Document doc = null;
        if(pElement instanceof Document)
            doc = (Document)pElement;
        else
            doc = pElement != null ? pElement.getOwnerDocument() : null;
        Node value = (Node)xPath.evaluate(xpathExpression, doc, XPathConstants.NODE);
        return value;
    }

    public static String valueOf(Element pElement, String xpathExpression)
        throws Exception
    {
        XPath xPath = createXPath();
        Document doc = null;
        if(pElement instanceof Document)
            doc = (Document)pElement;
        else
            doc = pElement != null ? pElement.getOwnerDocument() : null;
           
        String value = (String)xPath.evaluate(xpathExpression, doc, XPathConstants.STRING);
        return value;
    }

    public static String valueOf(Element pElement, String xpathExpression, Map prefixNamespaceMapping)
        throws Exception
    {
        XPath xPath = createXPath(prefixNamespaceMapping);
        Document doc = null;
        if(pElement instanceof Document)
            doc = (Document)pElement;
        else
            doc = pElement != null ? pElement.getOwnerDocument() : null;
        String value = (String)xPath.evaluate(xpathExpression, doc, XPathConstants.STRING);
        return value;
    }

    public static Number numberValueOf(Element pElement, String xpathExpression)
        throws Exception
    {
        XPath xPath = createXPath();
        Document doc = null;
        if(pElement instanceof Document)
            doc = (Document)pElement;
        else
            doc = pElement != null ? pElement.getOwnerDocument() : null;
        Number nValue = (Number)xPath.evaluate(xpathExpression, doc, XPathConstants.NUMBER);
        return nValue;
    }

    public static Number numberValueOf(Element pElement, String xpathExpression, Map prefixNamespaceMapping)
        throws Exception
    {
        XPath xPath = createXPath(prefixNamespaceMapping);
        Document doc = null;
        if(pElement instanceof Document)
            doc = (Document)pElement;
        else
            doc = pElement != null ? pElement.getOwnerDocument() : null;
        Number nValue = (Number)xPath.evaluate(xpathExpression, doc, XPathConstants.NUMBER);
        return nValue;
    }