Iterating an XML node list

IteratingXmlNodelList.xpp

    public boolean elementExists(str elementName, str attributeName, str attributeValue)
    {
        XmlNodeList nodes = xmlDocument.GetElementsByTagName(elementName);
        XMLNodeListIterator iterator = new XMLNodeListIterator(nodes);
 
        while (iterator.moreValues())
        {
            XmlElement e = iterator.value();
            str val = e.getAttribute(attributeName);

            if (val == attributeValue)
            {
                return true;
            }

            iterator.nextValue();
        }

        return false;
    }